Koh Lanta is very rich of dive site around the coast. The most famous is Hin Daeng and Hin Muong (Red Rock & Purple Rock) sites. They was rate from international dive magazine as top ten best dive site of the world. Other varieties are also value to visit; Koh Ha - underwater cavern, Shark Point, Hin Bida, Fantasy Rock and Ship wrack point.
There are a few international dive school on the island to serve you. Whatever you will take the full course or fun dive.