Here are the Details of Thailand.

When to go
Good All year round. Exceptional Nov - Apr.
Marine Life
Dive sites around Phuket offer a rich diversity, including whitetip sharks, rays, snappers and turtles. The Similan Islands have some of the best diving in Asia, with hard and soft corals as well as tropical and pelagic fish. Thailand's coral has been adversely affected by climatic changes over the last few years.
Diving
For beginners to advanced. Day-trip dive boats and liveaboards from Phuket.
Areas
Phuket's sites include Phi Phi Island, the Racha Island group and Shark Point Marine Sanctuary. Further afield, liveaboards visit the Andaman Sea's Similan and Surin islands and the Burma Banks
Cost
Moderate
In Water
Lightweight wetsuits or Lycra suits.
On Land
Light tropical clothing.
Hazards
Normal reef hazards.
Currency
The Baht.
Electricity
220V
Visas
True
Info
www.tourismthailand.org