Richelieu Rock is one of the best places in the world to dive with whale sharks and is easily the best site in Thailand diving for this amazing activity. Here divers will encounter the largest fish in the ocean which are rare almost everywhere in the world. With nothing else for miles around, the whale sharks are attracted to the rock to feed on the rich plank tonic blooms that occur here.

• Dive Type: Boat Dive
• Diver Level: Novice Diver - 20 + Dives
• Max Depth: 40m

Koh Tachai is located in Tachai Island and lies about halfway between the Surin and Similan Islands and is rated as one of the best sites for Thailand scuba liveaboards as it's normally visited on the way to Richelieu Rock from the Similans. There are several dive sites around the island but the most famous is Koh Tachai Plateau which lies southeast of the island, about one kilometre offshore. The plateau is a submerged crowned reef of hard sheet corals, and scattered boulders. These boulders provide great swim-throughs and cut-through opportunities.

• Dive Type: Boat Dive
• Diver Level: Advanced Open Water Diver
• Max Depth: 35m

This dive site is one of the best places in Thailand to see manta rays, especially from April to May.
Koh Bon Island lies an hour or so north of the Similan Islands. It has a 33 metre wall on its south side, facing a small cove, with a stepped edge pointing west and down to over 40m.

Here divers will have the opportunity to see leopard sharks, white tip sharks; soft corals the colours of turquoise, yellow and green dominate. If you listen carefully you'll hear the warning clicks of hundreds of nervous damselfish, and the coral crunching of hungry titan triggerfish.

• Dive Type: Boat Dive
• Diver Level: Novice Diver - 20 + Dives
• Max Depth: 40m

West of Eden basically comprises giant granite boulders that create nice canyons, with walls covered with colorful soft corals and giant sea fans. Some areas are characterized by rubble and sand slopes. The shallows are home to many reef fishes, and have stacked granite boulders covered with hard corals, soft corals, gorgonians and feather stars. This area is a nice place to look for macro subjects like nudibranchs and frogfish. Keep an eye out for cleaner pipefish and many banded pipefish in small crevices, as well as long-nose hawkfish perched in black coral bushes. The rubble and sand slope are good place to search for ribbon eels, dragonets and red fire gobies. Back at the reef, moray eels are quite common, as well as turtles and schools of angelfish. Occasionally, whitetip reef sharks cruise by.

• Dive Type: Boat Dive
• Diver Level: Open Water Diver
• Max Depth: 18

Honeymoon Bay leads off from Haad Lek (small beach) on Island Four. This reef is great for snorkelers and we often use it for the first swim of our 5 day cruise. Typically we’ll hitch a ride on our dedicated taxi (the dinghy) from Anita’s Reef and drop into the water just off the beach. As you swim south from the beach the sandy bottom develops into swathes of staghorn coral.

Pore corals fill-in the open patches along with larger rock formations. Visibility is usually very good here, so you have the opportunity of swimming as swallow or as deep as you like. The gentle sloping reef ensures everyone can stay within their comfort limits as they familiarize themselves with the water and their equipment.

A great place to find many of the smaller reef fish varieties, including everyone’s favourite ‘Nemo’ the Clownfish and his cousins. Moray, octopus, crocodile needle fish and the beautiful angelfish are all common here, and there is even a chance of a turtle every now and then. Honeymoon Bay leads off from Haad Lek (small beach) on Island Four. This reef is great for snorkelers and we often use it for the first swim of our 5 day cruise. Typically we’ll hitch a ride on our dedicated taxi (the dinghy) from Anita’s Reef and drop into the water just off the beach. As you swim south from the beach the sandy bottom develops into swathes of staghorn coral.

Pore corals fill-in the open patches along with larger rock formations. Visibility is usually very good here, so you have the opportunity of swimming as swallow or as deep as you like. The gentle sloping reef ensures everyone can stay within their comfort limits as they familiarize themselves with the water and their equipment.

A great place to find many of the smaller reef fish varieties, including everyone’s favourite ‘Nemo’ the Clownfish and his cousins. Moray, octopus, crocodile needle fish and the beautiful angelfish are all common here, and there is even a chance of a turtle every now and then.

• Dive Type:
• Diver Level: Open Water Diver
• Max Depth: 26m