Ok,
The Andaman Sea covers a large area, where are you based, and when do you want to do the dive?
If you are around Phuket: Shark Point, Anenome Reef, Koh Doc Mai
Phi Phi: Koh Bida Nok, Koh Dida Nai
Similans: ALL OF THEM
Surin: Richeliu Rock
Pm me for more details