I don't think that Pra Chaop Kiri Khan is a good place to do snorkeling but if you have much time, I would say that you should travel to the south of Thailand, to Samui or Suratthani or Kra Bi. But if you don't have much time to travel to the south, then you should go to Koh Chang in Trat province. It is a good place for snorkeling, swim and it doesn't take much time, about 5 hours drive from Bangkok.
Enjoy the beaches,
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