This will be my tenth NYE in a row in Bangkok. Mr. Megatop and I usually do something fairly casual on New Year's, like street food for dinner, then watch the fireworks from our room at a Riverside area hotel. Then to bed.
Never done the clubs like DJ Station, which I'm sure is a zoo (and likely a firetrap) on NYE. Babylon has lots of festivities around New Year's. The gay sois off Silom are probably pretty jumping but I'd be wary of crowds there too. A sign I'm getting older now? 37 and 42 here.