logo image

Island Dive Trips

Day Trips to Similan Islands
Koh Bon and Koh Tachai
by MV Chai Yo
header image

Diver at the Similans


Similans from above


Fish School

Best of February 2016 - Similan Islands

Similan Islands


Diver at the Similans

The Similan Islands are probably the most beautiful and diverse dive sites in Thailand. Day trips and liveaboards to the islands are among the most popular worldwide. They consist of nine islands of granite rock with partially lush tropical vegetation, lapped by crystal clear water and lined partly with fine white sandy beaches. The islands stretch over 25 kilometers, like a pearl necklace, from north to south on the Andaman Sea and located 65 km off the coast of Phang Nga province. They were declared a Marine National Park in 1982.

The Similans are ideal for observing or photographing small fish by its enormous biodiversity of tropical reef fish. But not only small fish visit here, even Leopard sharks or White and Black tip sharks are not rare also Manta rays and Whale sharks can be seen. You can visit the Similan Marine National Park from October to May on day trips or overnight trips, but you will find the best conditions from November to April.

Dive and snorkeling trips depart every Monday, Tuesday, Thursday, Friday, and Saturday visiting the destination Similan Islands and Wednesdays & Sundays also to Koh Bon and Koh Tachai. In the morning you travel by minibus to Tablamu where the comfortable dive boat MV Chai Yo is moored.

The staff try to make sure that also non-diving guests receive maximum attention, fun and safety.


Manta Ray at Koh Bon


Table Coral with Fish School


Gorgonia Sea Fan

Manta Show Koh Bon

Koh Bon


Manta Ray at Koh Bon

Koh Bon is located about 20km north of Similan Island #9 and features one of the only vertical walls in Thailand. The main dive site is on the southwestern point and has a step-down ridge that carries on to depths of over 45m. The eastern side of this ridge forms the wall and this is where most divers will enter the water and generally where the boats moor.

The western side of the ridge is more of a gentle slope with coral bommies forming mushroom-like formations out of the finger corals. On the ridge itself, seafans of different sizes, shapes and colors grow, and schooling fish swim in the current feeding. This is generally where most divers will sit most of the dive, hoping for a sighting of the manta rays which frequent this dive site. These creatures seem to travel from Bon to Tachai and back again during the diving season from October until May.

There is a pinnacle in the bay just to the north of the ridge. It's a deep rock but if you are an experienced diver it's worth the short bottom times you'll get as it's a very special site. Not all boats visit it and if conditions are not good (like the current is running strong), it's not worth the effort. But if the water is clear you're good with your air and the current is slack it's a stunning rock. It looks like a monolithic temple built by some ancient culture.


Koh Tachai


Feather Star


Sun Mushroom Coral

Fish Fish Fish ...

Koh Tachai


Koh Tachai

Twenty-five kilometers north of Koh Bon, Koh Tachai has an offshore underwater ridge that runs perpendicular to the island. Known as "Twin Peaks" this is considered to be one of the finest dives in the Kingdom of Thailand and is famous as a place to see not only the more common species of corals, fans and tropical fish, but larger animals such as rays, leopard sharks, nurse sharks and hawksbill turtles. Whale sharks and Manta rays make an appearance on a regular basis.

A ridge runs between the two pinnacles, though the southern rock is the one most people dive on as there are two boat moorings there which makes it easier for divers to descend in a strong current. If you have the air and the current is not too strong, it's worthwhile swimming to the other rock which comes up a bit shallower. However, most of the time the current runs perpendicular to the ridge making a long swim tiring.

It's heaven for the fish, though; they hunt and dart around, coming very close to divers, making the diving here about as exciting as it gets here in Thailand

Schedules MV Chai Yo, 15. October 2017 until 15. May 2018

Monday Similan Island #9 2 dives
Tuesday Similan Island #5 and #7 2 dives
Wednesday Koh Bon and Koh Tachai 3 dives For divers only
Thursday Similan Island #4 and #6 2 dives
Friday Similan Island #7 2 dives
Saturday Similan Island #8 2 dives
Sunday Koh Bon and Koh Tachai 2 dives Minimum age 12 years

MV Chai Yo has a seat capacity of up to 40 divers and 10 non-divers to take you comfortably and with style to the Similan Islands, Koh Bon and Koh Tachai.

Trips to the Richelieu Rock by Speed boat every Tuesday, Thursday and Saturday!

  PDF Downloads

 • Dive Action Plan 2017-18  
 • Similans, Koh Bon/Koh Tachai  
 • Dive Site Map  




Tigertail Seahorse


Christmas Tree Worm


Moray Eel in a coral






Pick up at your hotel between 7:00 and 7:45am. The boat departs from Tablamu pier at 8:00am. After the boat briefing you enjoy the European breakfast. Around 10:45 -11:00am the boat arrive with comfort and style at the Similan Islands or Koh Bon and Koh Tachai where you conduct the first dive & snorkel with professional Guides and right after that you will take lunch onboard. Around 1:30 - 2:00pm you prepare for our second dive which will be finished about 3:00pm.
After that the boat will begin the journey home to return around 5:00 - 5:30pm at Tablamu pier.

A mini-bus will take you back to your Resort.

The third dive on Wednesday will start about 3:30pm so you will be back at the pier about 7:30pm

Pick-Up Times
Baan Nam Kem pier - 06:45am (transfer + 600 THB / person)
Bang Sak Beach - 07:00am
Pak Weep Beach - 07:15am
Bang Niang Beach - 07:25am
Nang Thong Beach - 07:30am
Khao Lak Beach - 07:45am

We are happy to arrange as well day trip tours by speed boat to the Similan or Surin Islands.

Furthermore Speedboat Charter for diving or snorkel trips


Diving Trip to Similan Islands 2 dives 4500,-
Diving Trip to Koh Bon / Koh Tachai (Sunday) 2 dives 4700,-
Diving Trip to Koh Bon / Koh Tachai (Wednesday) 3 dives 5500,-

All prices in THB (Thai Baht).

Price included
Transfer from Khao Lak hotel / boat / hotel, lunch, drinking water, soft drinks, fruits, towel, mask and snorkel, fins, life jacket, guide, and liability insurance, NITROX.

Price not included
National Park entry fee per day 500 THB + diving fee 200 THB
Rental equipment per day - BCD 200 THB, regulator 200 THB, shorty 3mm 100 THB,
Dive computer per day 250 THB

You find the prices for non-divers and children on the snorkel page.

  PDF Downloads

 • Price List 2017-18