Costa Lanta
One of the coolest things about this boutique resort is that some of the rooms are "convertible": If you're too hot you can open up the "walls" and allow the breeze to blow through. That said, it's not over-designy; sustainability is the big theme and some describe it as sort of upscale camping, with air-conditioning and a nice bathroom. The resort is at the northern end of Klong Dao Beach—the quiet end of an already quiet beach. Isolation is a blessing here, as the resort has almost everything you might need, including a pool table and a spa. The water here is swimmable, and snorkeling around Kaw Kwang Cape, while not exceptional, is pleasant and there are fish to be seen.