The Thai islands are heaven. Beautiful beaches with sun and high temperatures all year long.
While nudism in Thailand is illegal, topless women are seen everywhere on Thai beaches and the locals are very tolerant.
I spent some time in Koh Samui, the famous beautiful island, at the Silver bay. It is a good place for those of us who enjoy snorkelling. Corals and beautiful fish can be seen in the water.
I swam 10 minutes away from the shore and found myself near rocks where I could remove my swim suit and leave it on the rock. There were no people in the water at all.
I could enjoy hours of nude snorkelling. Very recommended!