Transsexual
I do not know of any TS resorts except for the fake ones that support websites 
I have not been to Hedonism but heard very mixed things about it. My friend went with his woman about six years ago. They did not want to get naked and said the beach was divided into Nude and maybe topless or clothed. I remember him saying it was not full of beautiful people and he often saw senior citizens wearing gstrings with their balls hanging down to their knees, so not that attractive.
I think it boils down to your company. Another friend went with her boyfriend and was bisexual and apparently it was one wild vacation. Both said it was full of horny single guys trying to get laid.
I have seen ads for gg vacation spots but the rates were off the charts and the pics of the women did not equate to the amount you would have to pay. I'd say, hit a city that has a red light district, play safe, and shop for your favorite girl or ts girl.
3 specific alternatives (most of you probably already know about):
Nana Plaza in Bangkok is opening more ladyboy bars all the time.
Almost every bar in Pattaya (and there are literally thousands of them) now have at least one ladyboy (TS) available and dozens of bars are mostly (if not all) ladyboy-staffed.
Soi Crocodile off Soi Bangla in Patong on Phuket is a mini-"ts resort", complete with open-air dancing stage.
While you still have to book your "room" separately at these faux 'resorts', that only adds to your freedom of choice and movement -- and helps avoid having to look at all those (other) dirty old mongers with their balls sagging low. 
No wonder they call it the best of both worlds.