If you like the quiet life then Hua Hin would suit you. If you're looking for guys then you can obviously do that too but its not a 'gay destination'. There is an expat community there of both straight and gays, but there is almost no gay nightlife. Half the fun would be cruising...
There's a gay owned Art gallery (Art Jacky), Gaya Massage, G Club, Chic Bar, 80s Bar and Red Indian. Gay bars (apart from the 2sq meter Red Indian which has been around for a while) tend to come and go, and you can't rely on these places still being around in 6 months or a year. During the week they are pretty much dead.