If you have just one day to dive in Thailand, the best dive site is Richelieu Rock.
Our day trip with two dives to Richelieu Rock departs three days per week between November and April. Trips run on Tuesdays, Thursdays and Sundays. Departures from Khao Lak are at 8.30am, returning at about 4pm.
The price is 4,950 baht per diver plus 700 baht national park fee. If you need to rent equipment that's just 400 baht extra.
If you are staying in Phuket we can arrange transfers to the boat for you. It'll be aong day but worth it if you see a whale shark!