For hot season. The most foreign people to go to the sea. Maybe they like to go to Pattaya,Someone want to do something. A whore so many. The sea dirty too....hahaha... Pattaya It not popular for people in Thai. I think that the beautiful sea at Trang province and the sea in other province it ok. Such as the sea at Phuket province but it cost of living expensive.
The winter season. Maybe They go to Chiang Mai, Chiang Rai, Mae hong son and other province in the north part of Thailand. Beacause good weather and beautiful view.