The Andaman Sea side of Thailand offers the best diving. That is basically all the way down the west coast of Thailand from the border with Burma to the border with Malaysia. The area includes Koh Phuket, Koh Phi Phi, Krabi, Koh Lanta, Koh Taratuo, Similan Islands, Surin Islands, Richelieu Rock, Koh Bon and Koh Tachai. The best time to dive this area is during the northeast monsoon from November to April although many areas can be dived year round. Thailand's most famous diving is in the Similan Islands. The best way to dive the Similans is by liveaboard, departing from either Khao Lak or Phuket. Our Similan cruises also include Richelieu Rock, Koh Bon and Koh Tachai. Phuket and Koh Phi Phi are also among the best diving areas in Thailand, with huge limestone cliffs cascading to beautiful hard and soft coral reefs.