Wazee
I've spent some time in Tailand also. Tailand is one of my favorite countries. Koh Samui and Kho phangang were alot of fun, but there was no visibility while I was there (how about those omellettes). Koh Phi PHi was incredible, crystal clear with alot of coral and alot of fish. Here in Costa Rica the visibility comes and goes but the wildlife is incredible. More fish here than anywhere else I have been. I don't have the equipment for scuba yet. I enjoy freediving. Costa Rica is not a cheap as other places in the world, but it is worth every penny. Food is cheap, and it is possible to rent a house here for around $500 a month. Transportation is exspensive, unless you are willing to ride the bus or bike it. I have driven here three times from Texas. This way you get to visit many cool spots, bring all your gear and have transpo. while you are here. Central America is a tiny place, I can be in La Ceiba Honduras in 2 days. Tica bus lines is inexspensive and goes to every major city in Central America. Other good dive spots Corn Islands in Nicaragua, Bocas del Toro in Panama.