Heres a couple of beaches near chantaburi. Nothing flash but it gets the job done in the local style.
This is laem sing beach on the way to chao lay
There was no koont there on a weekday and the vendors were all over my ass, they do a bloody good seafood papaya salad though
The kids got busy with there sand casle making while i took a little snooze
Not the best beach ive ever been to but quite relaxing