diving in thailand

The Ultimate Guide To Exploring Thailand's Best Dive Sites

Fun diving in Thailand in 2026-2027: we answer your questions

As a dive operator, we are very lucky to be based on the west coast of Thailand and able to offer scuba diving cruises in Thailand as well as Myanmar.

Ranong is a small border city and a major fishing and trading port in Southern Thailand. The city is an attractive spot for growing numbers of travelers who want to explore a pair of exceptionally laid-back nearby Thai islands of Koh Phayam and Koh Chang Noi.

Burma being out of reach at the moment, we are reorienting all our cruises to the top diving sites in Thailand until further notice and have planned the next season with many cool cruises both in the North Andaman Islands and South Andaman!

Dive in Thailand? FAQ:

Why should you consider diving in Thailand?

Where to dive in Thailand?

When is the best season to dive in Thailand?

What is the best way to dive in Thailand?

Where are the best departure points for a diving liveaboard in Thailand?

Is there a fee to pay to dive in Thailand National Parks?

Can I go scuba diving in Thailand without certification?

Diving in Thailand vs. diving in Myanmar?

What is the cost of a dive in Thailand?

Are the cruises suitable for non-divers?

Why should you consider diving in Thailand in 2026-2027?

Thailand has some of the best dive sites in the world and is a world-famous destination to learn how to dive and explore the wealth of the underwater world in tropical waters.

Thailand is bordered by 2 seas: the Gulf of Thailand on the east and the Andaman Sea on the west. The country has a very strong tourism infrastructure able to cater to the large number of divers usually flowing into the country every year.

Where to dive in Thailand?

I suppose it all depends on what you are looking for…

If you have never dived and want a cheap PADI or SSI Open Water certification, Koh Tao is one of the cheapest places in the world to take a scuba diving course and offer easy diving and great learning conditions.

If you are looking for a day trip from Bangkok, Pattaya is the most accessible diving destination, just an hour’s drive from Bangkok, and is quite good for wreck diving, but don’t expect good visibility or marine life; you may be disappointed.

If you are looking for exceptional diving, the best dive spots are incontestably to be found on the West Coast, with usually a better visibility and wealth of marine life in its beautiful Marine National Parks.

Thailand offers some of the best diving in the world in the Andaman Sea, both north and south of the Andaman Sea.

The North Andaman (on the west coast of Thailand) is home to the Similan Islands and Surin National Parks, both popular for diving in Thailand.

The most famous one is for sure the Similan Islands National Park. But many divers don’t know that a little bit further north lie the Surin Islands, less known and less traveled than the Similan but also offering excellent diving and snorkeling.

You may have heard about the world-famous Richelieu Rock; this dive site is still listed as one of the top 10 dive sites in the world. Richelieu Rock (part of Surin National Park) and Koh Tachai (in Similan NP) both offer good chances to spot whale sharks amongst other treasures!

Thailand is also a great diving destination to dive with a giant oceanic manta ray, and Koh Bon is the diving spot in Thailand where these gentle giants are most often sighted.

The best dive sites in Thailand in 2026-2027 are surely Richelieu Rock, Koh Bon, and Koh Tachai.

When is the best season to dive in Thailand in 2026-2027?

Being a tropical country, Thailand has a dry and a rainy season; to make it simple, it rains on the West Coast during the summer months (May-October) and on the East during the winter (October-May).

The optimum diving season on the Andaman coast (west coast) is between November and May.

What is the best way to dive in Thailand? A liveaboard = dive, eat, sleep!

Taking a diving holiday on a Thai liveaboard is definitely the best option, as it allows you to dive up to 4 times a day and to experience early morning dives and night dives (which are two of the best times of the day to dive) and to visit the most remote and beautiful dive sites in Thailand.

In addition to having better dives, you also have a lot better time during your surface intervals:
Why would you sit on a small speedboat waiting for the next dive time when you could be relaxing in a hammock reading a good book? You want to rest and go to your comfortable cabin and bed for a real nap. Hungry? Liveaboards usually serve 4 delicious meals a day, and on our boat you also get a full buffet of snacks, fresh fruits, and drinks in the shaded lounge area. Still a lot of energy? Take the kayak around the island and hop on a beach.

Liveaboards are just more comfortable and a lot more FUN! The only way to truly enjoy a Thailand diving holiday is at the perfect rhythm of “Dive Eat Sleep“.

Where are the best departure points for a diving liveaboard in Thailand?

Khao Lak (and Tap Lamu Pier) has become the most common departure point for liveaboards in Thailand because it is the closest port to the Similan Islands.

Ranong, a bit further north, is a new departure point for dive cruises in Thailand (and the ultimate departure point for cruises in Myanmar). It is the closest departure point to dive Richelieu Rock, making it easier to dive Thailand’s best dive site on even the shortest cruise out of Ranong.

Phuket is the best departure point to reach the South Andaman on the route to Koh Lanta Marine National Park and Koh Lipe!

Reaching your liveaboard:
Ranong became a much more interesting departure point for dive cruises in Thailand since domestic low-cost airlines started flying to it from the local airport with 3 daily flights from Bangkok (DMK) to Ranong (UNN). Ranong Airport is only 20 minutes away from Ranong Pier!

Phuket Airport offers more flights and is an hour’s drive away from Khao Lak (tap Lamu Pier) or Chalong Pier.

And of course, in terms of boat, I’ll recommend you ours. But feel free to check online reviews and make your own choice:
Our Boat, The Smiling Seahorse, is the newest diving boat in Thailand, built in 2018 by and for divers, and only take up to 16 lucky guests in 8 comfortable cabins. It is the only boat with a well-fitted camera room, no dorm cabins (only twin and doubles) and no guests in the hull; everyone has a door and windows to enjoy the ocean view and breeze.

Is there a fee to pay to dive in Thailand National Parks?

Yes, there are park fees to pay to visit and dive in Thailand Marine National Parks.

The Similan Islands, Surin Islands, Koh Lanta, and Tarutao National Parks are popular destinations for snorkeling & diving and charge a fee that depends on the length of your trip, activity, and nationality.

Foreign divers will pay national park fees between 2000 THB on the shortest cruises and up to 4400 THB for the longest cruises visiting 5 marine parks.
Thai nationals and snorkelers pay slightly less.

Update about Similan National Park: since 2019 you need to apply for a visit permit in advance, and the number of visitors has been limited. For this reason we need to collect your passport numbers in advance.

Can I go Scuba diving in Thailand without certification?

Thailand is a great diving destination for divers of all levels, but if you have never dived, you should get some training with a dive professional.
The first level of certification, called PADI OpenWater certification, allows you to dive without the supervision of a dive professional (as a buddy pair) to up to 18 meters deep.
There are many dive schools where you could learn how to dive. Thailand being the world’s number 1 destination for diving tourism and the country that annually produces the most PADI diving certifications in the world, the quality of diving training and facilities is very high.
You could take a PADI course on a Thai liveaboard, but note that taking an open water course in Similan National Park is not allowed.

Dive in Thailand vs. diving in Myanmar?

North of the Similan island in the Andaman Sea can be found 800 islands making up the Mergui Archipelago in Myanmar.

While very close and seemingly part of the same archipelago, diving in Thailand and Myanmar is very different.

Thailand usually has bigger schools of fish such as barracuda, batfish, trevallies, and sweetlips, and the visibility is usually better there.

Richelieu Rock is the exception and looks more like Myanmar sites.

Diving in Myanmar tends to be slightly more challenging than diving in Thailand due to stronger currents and more swim-throughs but is a destination where you can be alone on every dive site.

Thailand offers more scenic dives appreciated by all, but Myanmar has more of the rare macro life searched for by very experienced divers.

What is the cost of diving in Thailand?

Thailand scuba diving is generally regarded as one of the best value in the world.

The price of a dive in Koh Tao can be as low as 800 THB these days, and prices of liveaboard are also seeing some unprecedented price cuts!

The price of your liveaboard in the Surin and Similan Islands will, of course, depend on the length of the trip, the dive sites you will visit, if you require dive courses or other options, and of course, the quality of your dive boat. Dive boats taking more divers are usually also cheaper because the running costs of the boat are cut in more parts, but these are also usually less service-oriented and enjoyable than smaller boats.

Dive cruises in Thailand in 2026 cost between 100 and 300 euros per day and per diver. The best value liveaboard in Thailand this season (2026-2027 ) is surely The Smiling Seahorse !

Are the cruises suitable for non-divers?

Non-divers are usually welcomed on all diving liveaboards and can equally enjoy the experience. There are untouched islands with wild sand beaches and clear water with great marine life and plenty of good snorkeling opportunities around Surin and Similan NPs. You can relax with a good book, go swimming, or use our kayak to explore the islands around.

Non-divers cruises can also be arranged to visit more beaches and shallow snorkeling spots, sea gypsy villages, or other adventures. For example, you could rent MV Smiling Seahorse for your group of friends/ family.

Sometimes, a Video Is Worth a Thousand Words...

      EXCELLENT  
   Based on 93 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Magda Kapusta 
 
 
 
 Trustindex verifies that the original source of the review is Google. My diving cruise with The Smiling Seahorse was absolutely fantastic from start to finish. Everything was extremely well organized and seamless, making the entire vacation completely stress-free and enjoyable.
The crew was exceptional — professional, friendly, attentive, and always making sure everyone felt comfortable and safe. The food was amazing throughout the trip, with great variety and quality at every meal.
The boat itself is excellent: very comfortable, well maintained, and thoughtfully designed for divers. The cabins are spacious and comfortable, and the common areas are very well organized, giving everyone plenty of space to relax between dives.
What truly made the experience unforgettable was the incredible selection of dive spots. Every dive offered something special, with beautiful marine life, stunning coral reefs, and perfectly planned itineraries.
Overall, this was a full enjoyment vacation and one of the best liveaboard experiences I’ve had. I highly recommend The Smiling Seahorse to anyone looking for a perfectly organized diving adventure with a fantastic crew and unforgettable diving.
  
 
      Posted on Google  
   
   Laura Forsyth 
 
 
 
 Trustindex verifies that the original source of the review is Google. Another vote for the Smiling Seahorse - it's a very good boat. Purpose built for serious diving, the thought and care put into it by its owner and crew really shows. Everything you need is available, easy to access, well maintained and functional, without anything extraneous or funky.  There is a devotion to diving, to underwater photography, to the marine life, to the history and natural history of the Similan Islands and Burma, to the guest experience and developing our skills. Our group did the week-long South to North Andaman Sea trip in January 2026, and each day was better than the one before. The diving is exceptional, with healthy corals and masses and masses of fish, even before we got to the climax of Richelieu Rock. They include an black water dive on each trip, a truly unique opportunity.

We received tremendous support from the dive guides and the crew alike, who gracefully and respectfully accommodated everyone's needs.  Even the little things - one of the deck crew noticed that the little strap connecting the dust cap to my regulator was close to breaking off and offered to repair it. He did a beautiful job and I'll be reminded of his generosity and kindness each time I dive that reg. Our guide, James, has years of experience, like many masters, conveyed his knowledge with simplicity and clarity (and humor - whew!). I became a better diver following his example. I keep remembering the happy anticipation of standing at the stern, all kitted up, waiting for the captain's signal to jump. Next trip - Burma.

The cabins are simple and comfortable,  although you may want to bring a pad if you're not a fan of firm beds. A/C and hot water in each cabin - all good.

Everyone in our group, from the experts with many thousands of dives to the recently certified, to a couple of non-diving spouses, loved the Smiling Seahorse!
  
 
      Posted on Google  
   
   Nadine Fischer 
 
 
 
 Trustindex verifies that the original source of the review is Google. We had an amazing time on the Smiling Seahorse liveaboard in Thailand. Everything was well organized, relaxed, and very professional.

Our dive guide Julien was fantastic. He showed us beautiful dive sites and even pointed out tiny nudibranchs we would never have seen ourselves. His eye for detail made every dive special.

The food was excellent, and the crew was incredibly friendly and helpful, especially when assisting with dive gear.

Overall, a wonderful experience – It was our 2nd trip and we will definitely come again!
  
 
      Posted on Google  
   
   Udi Nehab 
 
 
 
 Trustindex verifies that the original source of the review is Google. An Unforgettable Week Underwater!
I just wrapped up a phenomenal week-long liveaboard trip in the Similan Islands with The Smiling Seahorse team, and I cannot recommend them enough. The dives were absolutely gorgeous, but what really set the experience apart was Julian’s amazing spotting skills—he has an incredible eye and made sure we didn't miss a thing.
The entire crew was attentive, professional, and always right there to assist with all of our needs, making the whole week completely seamless. On top of the world-class diving, the food was fantastic. Everything was incredibly tasty, and they offered a great variety of dishes that really hit the spot after a long day in the water. Five stars across the board—if you're looking for a top-tier liveaboard operation, this is the team to go with!
  
 
      Posted on Google  
   
   Tsachi Yeshurun 
 
 
 
 Trustindex verifies that the original source of the review is Google. I went for a 9 day dive safari in Myanmar, the mergui archipelago, with the smiling seahorse. One of the unique experiences I had. My first (and second and third) Blackwater dive, dives I will never forget. The staff are wonderful, the dive guides are amazing, they actually care and put in a lot of extra effort and the ship crew were helpful and nice. I dove with Julian, the dive master, who I would dive with anywhere anytime, and we enjoyed the presence of camille, the owner, who lit up the place with her positive energies. I've been on fancier boats, but I enjoyed this one much better.
  
 
      Posted on Google  
   
   Lee Waggener 
 
 
 
 Trustindex verifies that the original source of the review is Google. Safe, clean, friendly staff always willing to help, easy on and off the boat, good dive sites. Guides are awesome. The dive crew very accommodating.  Nice camera room. Keep the same tank entire trip. Some sites we went in small groups in a dingy. The return the dingy would slowly pull you back. Thankful we did nit have to struggle getting back in the dingy Some times we would just float back to the boat. We were divided  into groups so everyone wasn’t getting ready at the same time. Plenty of food and snacks.  Only complaint is the chairs and beds are hard as cement. Compared to the good stuff that was nothing.  I would for sure go again.
  
 
      Posted on Google  
   
   Ray Busard 
 
 
 
 Trustindex verifies that the original source of the review is Google. We did seven days on the Smiling Seahorse level over. The crew the boat everything was amazing. The divers did 20+ dives and as a snooker we did four snorkels, which was totally unexpected and so delightful. Took us to some of the best Dive spots in the world and the pictures proved that’s true. The food on board was over the top!!  I would recommend this trip to anybody around the world!
  
 
      Posted on Google  
   
   ליאור ארד 
 
 
 
 Trustindex verifies that the original source of the review is Google. I just returned from a week-long liveaboard with the club, and the experience was simply outstanding. The entire team demonstrated high professionalism throughout, with in-depth safety briefings and modern, well-maintained equipment.
A special thanks to our amazing dive guides: James, Velika, Katie, and Mint. Each of them brought great energy and uncompromising expertise. Thanks to them, we felt in safe hands during every dive, and they knew exactly how to lead us to the most beautiful spots in the pristine sites we visited.
The boat was very comfortable, and the excellent food between dives rounded out the experience perfectly. This is without a doubt a top-tier diving club, and I highly recommend it to anyone looking for a week of peace and world-class diving!"
  
 
      Posted on Google  
   
   Itai Stadler 
 
 
 
 Trustindex verifies that the original source of the review is Google. An outstanding liveaboard experience from start to finish. The hospitality on The Smiling Seahorse is truly exceptional — warm, attentive, and genuine, making you feel welcome and taken care of at every moment.
The dive sites were beautiful and well chosen, offering a great variety and excellent conditions. Each dive felt thoughtfully planned to maximize both safety and enjoyment.
What really sets this liveaboard apart is the extraordinary professionalism of the crew and dive instructors. Their experience, calm approach, and attention to detail were evident throughout the trip. Briefings were clear and thorough, underwater guidance was excellent, and safety was always the top priority — without ever taking away from the fun.
Highly recommended for anyone looking for high-quality diving combined with top-level service and professionalism. I would gladly dive with them again.
  
 
      Posted on Google  
   
   Yossie Bar 
 
 
 
 Trustindex verifies that the original source of the review is Google. It was amazing!!!

Katie the diving guide is absolutely magnificent, friendly, crazy in a good way...

The team is just extraordinary!
Humble, helping wherever they can, the food is delicious and also satisfying, the boys helps greatly every time you come up from a dive...

The guides are funny and resourceful... It was really just a perfect time.

      EXCELLENT  
   Based on 227 reviews 
    
 
 
 
   
 
 
       Posted on Tripadvisor  
   
   Magda K 
 
 
 
 Verified Fantastic !
My diving cruise with The Smiling Seahorse was absolutely fantastic from start to finish. Everything was extremely well organized and seamless, making the entire vacation completely stress-free and enjoyable. The crew was exceptional — professional, friendly, attentive, and always making sure everyone felt comfortable and safe. The food was amazing throughout the trip, with great variety and quality at every meal. The boat itself is excellent: very comfortable, well maintained, and thoughtfully designed for divers. The cabins are spacious and comfortable, and the common areas are very well organized, giving everyone plenty of space to relax between dives. What truly made the experience unforgettable was the incredible selection of dive spots. Every dive offered something special, with beautiful marine life, stunning coral reefs, and perfectly planned itineraries. Overall, this was a full enjoyment vacation and one of the best liveaboard experiences I’ve had. I highly recommend The Smiling Seahorse to anyone looking for a perfectly organized diving adventure with a fantastic crew and unforgettable diving.
  
 
      Posted on Tripadvisor  
   
   ScenicPath 
 
 
 
 Verified A well-run boat with a fantastic crew and dive staff - highly recommended!
Another vote for the Smiling Seahorse - a very good boat. Purpose built for serious diving, the thought and care put into it by its owner and crew really shows. Everything you need is available, easy to access, well maintained and functional, without anything extraneous or funky. There is a devotion to diving, to underwater photography, to the marine life, to the history and natural history of the Similan Islands and Burma, to the guest experience and developing our skills. Our group did the week-long South to North Andaman Sea trip in January 2026, and each day was better than the one before. The diving is exceptional, with healthy corals and masses and masses of fish, even before we got to the climax of Richelieu Rock. They include an black water dive on each trip, a truly unique opportunity. We received tremendous support from the dive guides and the crew alike, who gracefully and respectfully accommodated everyone's needs. Even the little things - one of the deck crew noticed that the little strap connecting the dust cap to my regulator was close to breaking off and offered to repair it. He did a beautiful job and I'll be reminded of his generosity and kindness each time I dive that reg. Our guide, James, has years of experience, like many masters, conveyed his knowledge with simplicity and clarity (and humor - whew!). I became a better diver following his example. I keep remembering the happy anticipation of standing at the stern, all kitted up, waiting for the captain's signal to jump. Next trip - Burma. The cabins are simple and comfortable, although you may want to bring a pad if you're not a fan of firm beds. A/C and hot water in each cabin - all good. Everyone in our group, from the experts with many thousands of dives to the recently certified, to a couple of non-diving spouses, loved the Smiling Seahorse!
  
 
      Posted on Tripadvisor  
   
   izacassia 
 
 
 
 Verified Best scuba diving Safari in Thailand
These guys are incredible! 7 days of diving from the south to the north of the Andaman Sea. The staff are incredibly helpful and the food and atmosphere was great. Special thanks to Velika, our guide, that showed us many sea creatures from the micro (picachu) to the large (white tip shark). It was an adventure! Highly recommended.
  
 
      Posted on Tripadvisor  
   
   yiftah s 
 
 
 
 Verified The smiling seahorse experience
Amazing crew, beautiful dives and unbelievable atmosphere... Had the best two weeks of my life! ❤️❤️❤️
  
 
      Posted on Tripadvisor  
   
   Udi N 
 
 
 
 Verified An Unforgettable Week Underwater!
I just wrapped up a phenomenal week-long liveaboard trip in the Similan Islands with The Smiling Seahorse team, and I cannot recommend them enough. The dives were absolutely gorgeous, but what really set the experience apart was Julian’s amazing spotting skills—he has an incredible eye and made sure we didn't miss a thing. The entire crew was attentive, professional, and always right there to assist with all of our needs, making the whole week completely seamless. On top of the world-class diving, the food was fantastic. Everything was incredibly tasty, and they offered a great variety of dishes that really hit the spot after a long day in the water. Five stars across the board—if you're looking for a top-tier liveaboard operation, this is the team to go with!
  
 
      Posted on Tripadvisor  
   
   Alon kedar 
 
 
 
 Verified מעל ומבר
צללתי אתם באירגון של buddy divers היה נפלא מעל ומעבר לציפיות. הארגון היה מעולה, הצוות מקצועי, תומך ועוזר כל הדרך מלבישת הסנפירים לפני ועד עזרה בכל צורך. תודה גדולה למדריכת צלילה בשם ג׳וי היה נהדר. אלון
  
 
      Posted on Tripadvisor  
   
   Oren K 
 
 
 
 Verified Wonderful experience with the Smiling Seahorse
After 9 wonderful days of a diving safari in Myanmar on the Smiling Seahorse liveaboard, I have to say that it’s been a long time since I’ve come across people who are so professional at what they do. The dive guide team is top notch! The crew that takes care of the boat and the diving equipment is extremely professional, always thinking about every single detail and showing endless care for the guests. The boat feels very homely and warm, and it’s especially well suited for underwater photographers. Simply pure pleasure incredible diving, warmth, and love for the guests both above and below the water. Oren Kidron
  
 
      Posted on Tripadvisor  
   
   עדי א 
 
 
 
 Verified Don’t miss this liveaboard trip!
The trip was amazing! I had so much fun and I really didn’t want it to end. Velica my guide was the nicest, so caring and professional and fun to dive with, and made me feel very safe. All the stuff was very friendly, professional and personal, and made the whole experience something I’ll never forget. The boat was comfortable and clean, the food was delicious, and the overall vibe on board was relaxed and fun. Beautiful dive sites and amazing dives. I highly recommend it for anyone looking for an unforgettable diving adventure. I would definitely dive with them again!
  
 
      Posted on Tripadvisor  
   
   Yossie Feldman 
 
 
 
 Verified Amazing experience, go!!!
It was amazing!!! Katie the diving guide is absolutely magnificent, friendly, crazy in a good way... The team is just extraordinary! Humble, helping wherever they can, the food is delicious and also satisfying, the boys helps greatly every time you come up from a dive... The guides are funny and resourceful... It was really just a perfect time.
  
 
      Posted on Tripadvisor  
   
   Are R 
 
 
 
 Verified Amazing company to go diving with.
They picked us up at Koh Phayam even though they are based in Ranong, and helped us organize our transport onwards from Ranong after the trip. James organizes everything with a steady hand and a twinkle in the eye. You will not be bored during briefings on the smiling sea horse. Our guide, Veli Ka, was just amazing as well. So full of knowledge and safe and fun to dive with. All the crew were really nice - seems like a great work environment. The boat itself was really comfortable with a big lounge, sun deck, AC rooms with private bathrooms. Not crowded at all. The food was mouth watering as well. 5 stars!

Fun diving in Thailand in 2026-2027: we answer your questions

The Smiling Seahorse has been taking happy customers to dive Thailand and Myanmar since 2012.

As dive operator, we are very lucky to be based on the west coast of Thailand, and able to offer scuba diving cruises in Thailand as well as Myanmar.

Ranong is a small border city and a major fishing and trading port in Southern Thailand. The city is an attractive spot for growing numbers of travellers who want to explore a pair of exceptionally laid-back nearby Thai islands of Koh Phayam and Koh Chang Noi.

Dive in Thailand? FAQ:

Why should you consider diving Thailand?
Where to dive in Thailand?
When is the best season to dive in Thailand?
What is the best way to dive Thailand?
Where are the best departure points for a diving liveaboard in Thailand?
Is there a fee to pay to dive in Thailand National Parks?
Can I go Scuba diving in Thailand without certification?
Diving Thailand VS diving Myanmar?
What is the cost of dive in Thailand?
Are the cruises suitable for non divers?

Why should you consider diving in Thailand in 2026-2027?

Thailand has some of the best dive sites in the world and is a worldly famous destination to learn how to dive and explore the wealth of the underwater world in tropical waters.

Thailand is bordered by 2 seas: the Gulf of Thailand on the East and the Andaman Sea on the West. The country has a very strong tourism infrastructure able to cater to the large number of divers usually flowing into the country every year.

Where to dive in Thailand?

I suppose it all depends what you are looking for…

If you have never dived and want a cheap PADI or SSI Open Water certification, Koh tao is one of the cheapest place in the world to take a scuba diving course and offer easy diving and great learning conditions.

If you are looking for a day trip from Bangkok, Pattaya is the most accessible diving destination in just an hour drive from Bangkok and is quite good for wreck diving but don’t expect a good visibility or marine life you may be disappointed.

If you are looking for exceptional diving, the best dive spots are incontestably to be found on the West coast with usually a better visibility and wealth of marine life in its beautiful Marine National Parks.

Thailand offers some of the best diving in the world in the Andaman Sea both in the North and South of the Andaman Sea.

The North Andaman (on the West coast of Thailand) is home to the Similan islands and Surin national parks both popular for diving in Thailand.

The most famous one is for sure the Similan Islands National park. But many divers don’t know that a little bit further North lie the Surin Islands, less known and less traveled than the Similan but also offering excellent diving and snorkeling.

You may have heard about the world famous Richelieu Rock; this dive site is still listed as one of the top 10 dive sites in the world. Richelieu Rock (part of Surin National park) and Koh Tachai (in Similan NP) both offers good chances to spot a Whale Sharks amongst other treasures!

Thailand is also a great diving destinations to dive with a giant Oceanic Manta Ray and Koh Bon is the diving spot in Thailand where these gentle giants are most often sighted.

The best dive sites in Thailand in 2026-2027 are surely Richelieu Rock, Koh Bon and Koh Tachai.

Less explored The South Andaman Sea also has some pretty dive sites which is why we decided to move our boat to Phuket for a few Special cruises in the South Andaman in 2026-2027 Season!

To the East of Phuket lies the Phi Phi islands, Koh Lanta National Park (Hin Muang and Hin Daeng) known for Mantas and Leopard sharks as well as Koh Lipe, a hot spot for Macro life and frog fish sighting!

When is the best season to dive Thailand in 2026-2027?

Being a tropical country, Thailand has a dry and a rainy season, to make it simple, it rains on the West coast during the Summer months (May- October) and on the East during the winter (October- May).

The optimum diving season on the Andaman coast (west coast) is between November and May.

What is the best way to dive in Thailand? A liveaboard = dive eat sleep!

Taking a diving holiday on a Thai Liveaboard is definilty the best option as it allows you to be to dive up to 4 times a day and to experience early morning dives and night dives (which are two of the best times of the day to dive) and to visit the most remote and beautiful dive sites in Thailand.

In addition to having better dives, you also have a lot better time during your surface intervals:
Why would you sit on a small speed boat waiting for the next dive time when you could be relaxing in a hammock reading a good book? You want to rest, go to your comfortable cabin and bed for a real nap. Hungry? Liveaboards usually serve 4 delicious meals a day and on our boat you also get a full buffet of snack, fresh fruits and drinks in the shaded lounge area. Still a lot of energy? Take the kayak around the island and hop on a beach.

Liveaboards are just more comfortable and a lot more FUN! The only way to truly enjoy a Thailand diving holiday at the perfect rhythm of “Dive Eat Sleep“.

Where are the best departure points for a diving liveaboard in Thailand?

Khao Lak (and Tap Lamu pier) has become the most common departure points for Liveaboards in Thailand because it is the closest port to the Similan islands.

Ranong, a bit further north is a new departure point for dive cruises in Thailand (and the ultimate departure point for cruises in Myanmar). It is the closest departure point to dive Richelieu Rock making it easier to dive Thailand’s best dive site on even the shortest cruise out of Ranong.

Phuket is the best departure point to reach the South Andaman on route to Koh Lanta Marine national park and Koh Lipe!

Reaching your liveaboard:
Ranong became a much more interesting departure point for dive cruises in Thailand since domestic alow cost airlines started flying to it local airport with 3 daily flights from Bangkok (DMK) to Ranong (UNN). Ranong airport is only 20 minutes away from Ranong Pier!

Phuket Airport offer more flights and is an hour drive away from Khao Lak (tap Lamu pier) or Chalong pier.

And of course in term of boat, I’ll recommend you ours. But feel free to check online reviews and make your own choice:
Our Boat, The Smiling Seahorse is the newest diving boat in Thailand, built in 2018 by and for divers and only take up to 16 lucky guests in 8 comfortable cabins it is the only boat with a well-fitted camera room, no dorm cabins (only twin and doubles) and no guest in the hull, everyone has a door and windows to enjoy the ocean view and breeze.

Is there a fee to pay to dive in Thailand National Parks?

Yes there are parks fees to pay to visit and dive in Thailand Marine National parks.

Similan Islands, Surin Islands, Koh Lanta and Tarutao National Parks are popular destinations for snorkeling & diving and charge a fee which depends on the length of your trip, activity, and nationality.

Foreign divers will pay National park fees between 2000 THB on the shortest cruises to up to 4400 THB for the longest cruises visiting 5 marine parks.
Thai nationals and snorkelers pay slightly less.

Update about Similan National parks: since 2019 you need apply for visit permit in advance and number of visitors has been limited. For this reason we need to collect your passport numbers in advance.

Can I go Scuba diving in Thailand without certification?

Thailand is a great diving destination for divers of all levels but if you have never dived, you should get some training with a dive professional.
The first level of certification called PADI OpenWater certification allows you to dive without the supervision of a dive professional (as buddy pair) to up to 18 meters deep.
There are many dive schools where you could learn how to dive. Thailand being the world’s number 1 destination for diving tourism and the country that annually produces the most PADI diving certifications in the world, the quality of diving training and facilities is very high.
You could take a PADI course on a Thai liveaboard but note that taking an open water course in Similan National park is not allowed.

Dive Thailand VS diving Myanmar?

North of the Similan island in the Andaman Sea can be found 800 islands making up the Mergui Archipelago in Myanmar.
While very close and seemingly part of the same archipelago, diving in Thailand and Myanmar are very different.
Thailand usually has bigger schools of fish such as barracuda, batfish, trevallies and sweetlips and the visibility is usually better there.

While Thai dive sites, especially those in the Similan Islands, are mostly coral-encrusted granite boulders, those in the Mergui are typically limestone islets, riddled with ledges and crevices, providing shelter for a wide range of rare macro life.
Richelieu rock is the exception and looks more like Myanmar sites.
Diving in Myanmar tends to be slightly more challenging than diving in Thailand due to stronger currents, and more swim throughs but is a destination where you can be alone on every dive site.
Thailand offers more scenic dives appreciated by all but Myanmar has more of the rare macro life searched by very experienced divers.

What is the cost of diving in Thailand?

Thailand scuba diving is generally regarded as one of the best value in the world.
The price of a dive in Koh Tao can be as low as 800thb these days and prices of liveaboard are also seeing some unprecedented price cuts!
The price of your liveaboard in Surin and Similan islands will of course depend on the length of trip, the dive sites you will visit, if you require dive courses or other options and of course the quality of your dive boat. Dive boats taking more divers are usually also cheaper because the running costs of the boat are cut in more parts, but these are also usually less service oriented and enjoyable as smaller boats.
Dive cruises in Thailand in 2026 cost between 100 and 300 euros per day and per diver. The best value liveaboard in Thailand this season (2026-2027 ) is surely The Smiling Seahorse !

Are the cruises suitable for non divers?

Non-divers are usually welcomed on all diving liveaboards and can equally enjoy the experience. There are untouched islands with wild sand beaches, clear water with great marine life and plenty of good snorkeling opportunities around surin and similan NPs, you can relax with a good book, go swimming or use our Kayak to explore the islands around.
Non divers cruises can also be arranged to visit more beaches and shallow snorkeling spots, sea gypsy villages or other adventures. For example you could rent MV Smiling seahorse for your group of friends/ family.

Watch what our guests had to say about their cruise with us in Thailand's Andaman Sea!

      EXCELLENT  
   Based on 93 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Magda Kapusta 
 
 
 
 Trustindex verifies that the original source of the review is Google. My diving cruise with The Smiling Seahorse was absolutely fantastic from start to finish. Everything was extremely well organized and seamless, making the entire vacation completely stress-free and enjoyable.
The crew was exceptional — professional, friendly, attentive, and always making sure everyone felt comfortable and safe. The food was amazing throughout the trip, with great variety and quality at every meal.
The boat itself is excellent: very comfortable, well maintained, and thoughtfully designed for divers. The cabins are spacious and comfortable, and the common areas are very well organized, giving everyone plenty of space to relax between dives.
What truly made the experience unforgettable was the incredible selection of dive spots. Every dive offered something special, with beautiful marine life, stunning coral reefs, and perfectly planned itineraries.
Overall, this was a full enjoyment vacation and one of the best liveaboard experiences I’ve had. I highly recommend The Smiling Seahorse to anyone looking for a perfectly organized diving adventure with a fantastic crew and unforgettable diving.
  
 
      Posted on Google  
   
   Laura Forsyth 
 
 
 
 Trustindex verifies that the original source of the review is Google. Another vote for the Smiling Seahorse - it's a very good boat. Purpose built for serious diving, the thought and care put into it by its owner and crew really shows. Everything you need is available, easy to access, well maintained and functional, without anything extraneous or funky.  There is a devotion to diving, to underwater photography, to the marine life, to the history and natural history of the Similan Islands and Burma, to the guest experience and developing our skills. Our group did the week-long South to North Andaman Sea trip in January 2026, and each day was better than the one before. The diving is exceptional, with healthy corals and masses and masses of fish, even before we got to the climax of Richelieu Rock. They include an black water dive on each trip, a truly unique opportunity.

We received tremendous support from the dive guides and the crew alike, who gracefully and respectfully accommodated everyone's needs.  Even the little things - one of the deck crew noticed that the little strap connecting the dust cap to my regulator was close to breaking off and offered to repair it. He did a beautiful job and I'll be reminded of his generosity and kindness each time I dive that reg. Our guide, James, has years of experience, like many masters, conveyed his knowledge with simplicity and clarity (and humor - whew!). I became a better diver following his example. I keep remembering the happy anticipation of standing at the stern, all kitted up, waiting for the captain's signal to jump. Next trip - Burma.

The cabins are simple and comfortable,  although you may want to bring a pad if you're not a fan of firm beds. A/C and hot water in each cabin - all good.

Everyone in our group, from the experts with many thousands of dives to the recently certified, to a couple of non-diving spouses, loved the Smiling Seahorse!
  
 
      Posted on Google  
   
   Nadine Fischer 
 
 
 
 Trustindex verifies that the original source of the review is Google. We had an amazing time on the Smiling Seahorse liveaboard in Thailand. Everything was well organized, relaxed, and very professional.

Our dive guide Julien was fantastic. He showed us beautiful dive sites and even pointed out tiny nudibranchs we would never have seen ourselves. His eye for detail made every dive special.

The food was excellent, and the crew was incredibly friendly and helpful, especially when assisting with dive gear.

Overall, a wonderful experience – It was our 2nd trip and we will definitely come again!
  
 
      Posted on Google  
   
   Udi Nehab 
 
 
 
 Trustindex verifies that the original source of the review is Google. An Unforgettable Week Underwater!
I just wrapped up a phenomenal week-long liveaboard trip in the Similan Islands with The Smiling Seahorse team, and I cannot recommend them enough. The dives were absolutely gorgeous, but what really set the experience apart was Julian’s amazing spotting skills—he has an incredible eye and made sure we didn't miss a thing.
The entire crew was attentive, professional, and always right there to assist with all of our needs, making the whole week completely seamless. On top of the world-class diving, the food was fantastic. Everything was incredibly tasty, and they offered a great variety of dishes that really hit the spot after a long day in the water. Five stars across the board—if you're looking for a top-tier liveaboard operation, this is the team to go with!
  
 
      Posted on Google  
   
   Tsachi Yeshurun 
 
 
 
 Trustindex verifies that the original source of the review is Google. I went for a 9 day dive safari in Myanmar, the mergui archipelago, with the smiling seahorse. One of the unique experiences I had. My first (and second and third) Blackwater dive, dives I will never forget. The staff are wonderful, the dive guides are amazing, they actually care and put in a lot of extra effort and the ship crew were helpful and nice. I dove with Julian, the dive master, who I would dive with anywhere anytime, and we enjoyed the presence of camille, the owner, who lit up the place with her positive energies. I've been on fancier boats, but I enjoyed this one much better.
  
 
      Posted on Google  
   
   Lee Waggener 
 
 
 
 Trustindex verifies that the original source of the review is Google. Safe, clean, friendly staff always willing to help, easy on and off the boat, good dive sites. Guides are awesome. The dive crew very accommodating.  Nice camera room. Keep the same tank entire trip. Some sites we went in small groups in a dingy. The return the dingy would slowly pull you back. Thankful we did nit have to struggle getting back in the dingy Some times we would just float back to the boat. We were divided  into groups so everyone wasn’t getting ready at the same time. Plenty of food and snacks.  Only complaint is the chairs and beds are hard as cement. Compared to the good stuff that was nothing.  I would for sure go again.
  
 
      Posted on Google  
   
   Ray Busard 
 
 
 
 Trustindex verifies that the original source of the review is Google. We did seven days on the Smiling Seahorse level over. The crew the boat everything was amazing. The divers did 20+ dives and as a snooker we did four snorkels, which was totally unexpected and so delightful. Took us to some of the best Dive spots in the world and the pictures proved that’s true. The food on board was over the top!!  I would recommend this trip to anybody around the world!
  
 
      Posted on Google  
   
   ליאור ארד 
 
 
 
 Trustindex verifies that the original source of the review is Google. I just returned from a week-long liveaboard with the club, and the experience was simply outstanding. The entire team demonstrated high professionalism throughout, with in-depth safety briefings and modern, well-maintained equipment.
A special thanks to our amazing dive guides: James, Velika, Katie, and Mint. Each of them brought great energy and uncompromising expertise. Thanks to them, we felt in safe hands during every dive, and they knew exactly how to lead us to the most beautiful spots in the pristine sites we visited.
The boat was very comfortable, and the excellent food between dives rounded out the experience perfectly. This is without a doubt a top-tier diving club, and I highly recommend it to anyone looking for a week of peace and world-class diving!"
  
 
      Posted on Google  
   
   Itai Stadler 
 
 
 
 Trustindex verifies that the original source of the review is Google. An outstanding liveaboard experience from start to finish. The hospitality on The Smiling Seahorse is truly exceptional — warm, attentive, and genuine, making you feel welcome and taken care of at every moment.
The dive sites were beautiful and well chosen, offering a great variety and excellent conditions. Each dive felt thoughtfully planned to maximize both safety and enjoyment.
What really sets this liveaboard apart is the extraordinary professionalism of the crew and dive instructors. Their experience, calm approach, and attention to detail were evident throughout the trip. Briefings were clear and thorough, underwater guidance was excellent, and safety was always the top priority — without ever taking away from the fun.
Highly recommended for anyone looking for high-quality diving combined with top-level service and professionalism. I would gladly dive with them again.
  
 
      Posted on Google  
   
   Yossie Bar 
 
 
 
 Trustindex verifies that the original source of the review is Google. It was amazing!!!

Katie the diving guide is absolutely magnificent, friendly, crazy in a good way...

The team is just extraordinary!
Humble, helping wherever they can, the food is delicious and also satisfying, the boys helps greatly every time you come up from a dive...

The guides are funny and resourceful... It was really just a perfect time.

      EXCELLENT  
   Based on 227 reviews 
    
 
 
 
   
 
 
       Posted on Tripadvisor  
   
   Magda K 
 
 
 
 Verified Fantastic !
My diving cruise with The Smiling Seahorse was absolutely fantastic from start to finish. Everything was extremely well organized and seamless, making the entire vacation completely stress-free and enjoyable. The crew was exceptional — professional, friendly, attentive, and always making sure everyone felt comfortable and safe. The food was amazing throughout the trip, with great variety and quality at every meal. The boat itself is excellent: very comfortable, well maintained, and thoughtfully designed for divers. The cabins are spacious and comfortable, and the common areas are very well organized, giving everyone plenty of space to relax between dives. What truly made the experience unforgettable was the incredible selection of dive spots. Every dive offered something special, with beautiful marine life, stunning coral reefs, and perfectly planned itineraries. Overall, this was a full enjoyment vacation and one of the best liveaboard experiences I’ve had. I highly recommend The Smiling Seahorse to anyone looking for a perfectly organized diving adventure with a fantastic crew and unforgettable diving.
  
 
      Posted on Tripadvisor  
   
   ScenicPath 
 
 
 
 Verified A well-run boat with a fantastic crew and dive staff - highly recommended!
Another vote for the Smiling Seahorse - a very good boat. Purpose built for serious diving, the thought and care put into it by its owner and crew really shows. Everything you need is available, easy to access, well maintained and functional, without anything extraneous or funky. There is a devotion to diving, to underwater photography, to the marine life, to the history and natural history of the Similan Islands and Burma, to the guest experience and developing our skills. Our group did the week-long South to North Andaman Sea trip in January 2026, and each day was better than the one before. The diving is exceptional, with healthy corals and masses and masses of fish, even before we got to the climax of Richelieu Rock. They include an black water dive on each trip, a truly unique opportunity. We received tremendous support from the dive guides and the crew alike, who gracefully and respectfully accommodated everyone's needs. Even the little things - one of the deck crew noticed that the little strap connecting the dust cap to my regulator was close to breaking off and offered to repair it. He did a beautiful job and I'll be reminded of his generosity and kindness each time I dive that reg. Our guide, James, has years of experience, like many masters, conveyed his knowledge with simplicity and clarity (and humor - whew!). I became a better diver following his example. I keep remembering the happy anticipation of standing at the stern, all kitted up, waiting for the captain's signal to jump. Next trip - Burma. The cabins are simple and comfortable, although you may want to bring a pad if you're not a fan of firm beds. A/C and hot water in each cabin - all good. Everyone in our group, from the experts with many thousands of dives to the recently certified, to a couple of non-diving spouses, loved the Smiling Seahorse!
  
 
      Posted on Tripadvisor  
   
   izacassia 
 
 
 
 Verified Best scuba diving Safari in Thailand
These guys are incredible! 7 days of diving from the south to the north of the Andaman Sea. The staff are incredibly helpful and the food and atmosphere was great. Special thanks to Velika, our guide, that showed us many sea creatures from the micro (picachu) to the large (white tip shark). It was an adventure! Highly recommended.
  
 
      Posted on Tripadvisor  
   
   yiftah s 
 
 
 
 Verified The smiling seahorse experience
Amazing crew, beautiful dives and unbelievable atmosphere... Had the best two weeks of my life! ❤️❤️❤️
  
 
      Posted on Tripadvisor  
   
   Udi N 
 
 
 
 Verified An Unforgettable Week Underwater!
I just wrapped up a phenomenal week-long liveaboard trip in the Similan Islands with The Smiling Seahorse team, and I cannot recommend them enough. The dives were absolutely gorgeous, but what really set the experience apart was Julian’s amazing spotting skills—he has an incredible eye and made sure we didn't miss a thing. The entire crew was attentive, professional, and always right there to assist with all of our needs, making the whole week completely seamless. On top of the world-class diving, the food was fantastic. Everything was incredibly tasty, and they offered a great variety of dishes that really hit the spot after a long day in the water. Five stars across the board—if you're looking for a top-tier liveaboard operation, this is the team to go with!
  
 
      Posted on Tripadvisor  
   
   Alon kedar 
 
 
 
 Verified מעל ומבר
צללתי אתם באירגון של buddy divers היה נפלא מעל ומעבר לציפיות. הארגון היה מעולה, הצוות מקצועי, תומך ועוזר כל הדרך מלבישת הסנפירים לפני ועד עזרה בכל צורך. תודה גדולה למדריכת צלילה בשם ג׳וי היה נהדר. אלון
  
 
      Posted on Tripadvisor  
   
   Oren K 
 
 
 
 Verified Wonderful experience with the Smiling Seahorse
After 9 wonderful days of a diving safari in Myanmar on the Smiling Seahorse liveaboard, I have to say that it’s been a long time since I’ve come across people who are so professional at what they do. The dive guide team is top notch! The crew that takes care of the boat and the diving equipment is extremely professional, always thinking about every single detail and showing endless care for the guests. The boat feels very homely and warm, and it’s especially well suited for underwater photographers. Simply pure pleasure incredible diving, warmth, and love for the guests both above and below the water. Oren Kidron
  
 
      Posted on Tripadvisor  
   
   עדי א 
 
 
 
 Verified Don’t miss this liveaboard trip!
The trip was amazing! I had so much fun and I really didn’t want it to end. Velica my guide was the nicest, so caring and professional and fun to dive with, and made me feel very safe. All the stuff was very friendly, professional and personal, and made the whole experience something I’ll never forget. The boat was comfortable and clean, the food was delicious, and the overall vibe on board was relaxed and fun. Beautiful dive sites and amazing dives. I highly recommend it for anyone looking for an unforgettable diving adventure. I would definitely dive with them again!
  
 
      Posted on Tripadvisor  
   
   Yossie Feldman 
 
 
 
 Verified Amazing experience, go!!!
It was amazing!!! Katie the diving guide is absolutely magnificent, friendly, crazy in a good way... The team is just extraordinary! Humble, helping wherever they can, the food is delicious and also satisfying, the boys helps greatly every time you come up from a dive... The guides are funny and resourceful... It was really just a perfect time.
  
 
      Posted on Tripadvisor  
   
   Are R 
 
 
 
 Verified Amazing company to go diving with.
They picked us up at Koh Phayam even though they are based in Ranong, and helped us organize our transport onwards from Ranong after the trip. James organizes everything with a steady hand and a twinkle in the eye. You will not be bored during briefings on the smiling sea horse. Our guide, Veli Ka, was just amazing as well. So full of knowledge and safe and fun to dive with. All the crew were really nice - seems like a great work environment. The boat itself was really comfortable with a big lounge, sun deck, AC rooms with private bathrooms. Not crowded at all. The food was mouth watering as well. 5 stars!

diving in thailand

Fun diving in Thailand in 2026-2027: we answer your questions

Dive in Thailand? FAQ:

Why should you consider diving in Thailand in 2026-2027?

Where to dive in Thailand?

Thailand offers some of the best diving in the world in the Andaman Sea, both north and south of the Andaman Sea.

When is the best season to dive in Thailand in 2026-2027?

What is the best way to dive in Thailand? A liveaboard = dive, eat, sleep!

Where are the best departure points for a diving liveaboard in Thailand?

Is there a fee to pay to dive in Thailand National Parks?

Can I go Scuba diving in Thailand without certification?

Dive in Thailand vs. diving in Myanmar?

What is the cost of diving in Thailand?

Are the cruises suitable for non-divers?

Sometimes, a Video Is Worth a Thousand Words...

Fun diving in Thailand in 2026-2027: we answer your questions

The Smiling Seahorse has been taking happy customers to dive Thailand and Myanmar since 2012.

Dive in Thailand? FAQ:

Why should you consider diving in Thailand in 2026-2027?

Where to dive in Thailand?

When is the best season to dive Thailand in 2026-2027?

What is the best way to dive in Thailand? A liveaboard = dive eat sleep!

Where are the best departure points for a diving liveaboard in Thailand?

Is there a fee to pay to dive in Thailand National Parks?

Can I go Scuba diving in Thailand without certification?

Dive Thailand VS diving Myanmar?

What is the cost of diving in Thailand?

Are the cruises suitable for non divers?

Watch what our guests had to say about their cruise with us in Thailand's Andaman Sea!

8-Day Diving Cruise in the North Andaman Sea

Prices per diver — after 10% discount

Standard Cabin

Deluxe Cabin

Master Cabin