Nai Thon Beach is not exactly crowded with tourists. In the low season, you can usually have the beach all to yourself. Even in the high season, the tourists may be few and far between. It is not because the beach is worthless, quite the contrary as both the water and the sand quality is very good. The few guests are mainly because there are not many hotels here and because the beach is off the beaten track.
Read more in the article Nai Thon Beach.