OK folks

here is a thread where you can keep the best snorkelling areas updated

for me, most of Thailand seems to be not good as the visibilty is poor, the corals have died or have been ruined, and the fishes eaten

prove me wrong please, as I love snorkelling and want to find good places

my own partial recommendation would be Koh Wai (part of the Koh Chang group)

The visibility is poor to Ok, the reef is easy to reach without a boat, or you can go on a day trip by boat to other small islands where the visibity is much better

It has improved slowly over the past few years, due to some protection, you can actually see new corals growing back. In addition, some bigger fishes can be seen.