Great question! If you're just asking about water we'd have to say something on the Andaman coast only because the Chao Phraya river empties into the Bay of Thailand so any of the beaches surrounding the bay while fine can't possibly be as clean as those of the Andaman. If you're really asking about beaches then that's a really tough question as there are many criteria that go into evaluating a beach. Bottom line is we don't have a best but our favorite is the beach at Prachuap Kiri Khan that we showcased in Episode #1 of this Southern Thailand Road Trip series.
