Diving the Islands of Thailand - Koh Phi Ohi,
Around Koh Phi Phi, Koh Tao, Koh lipe. You will find dive sites that varies tremendously in both topography and marine life. From shallow bays with slowly sloping reefs, to offshore islands with larger walls and mystic caverns, you will not get bored!
Expect to see a great deal of weird macro life that is rare and special to most divers. And, in season, you might get lucky seeing the gracious Manta Rays cruising past.
Koh Phi Phi is, for good reasons, one of the most popular islands in Thailand. You need to check it out for yourself.