We went to Krabi on number of occasions pre-Covid. And we loved it. However, a standing -joke between us (one which only Britons will understand) is that we were "the only gays in the village."
However, on the final occasion, we did see one couple similar to us in Aonang. There was no sign of any gay bars though we weren't looking for any. I think there was a soi with lady-bars near the beach.
The boat trips were fun- the usual island ones, but very unusually, for Thailand, we didn't feel as comfortable as we usually do. Not Thais, I hasten to add, but some falang passengers. However the hotels we tried- Golden Beach and Aonang Villas (cheap off-season prices at the latter facilitated this) made us the very welcome.
If you make your own amusement, I recommend Krabi. But not, by the way, in the rainy season.