For Polo Beach it seems most guys have resorted to bringing tents with them so they can get their action on in there. The nude section at Diamond Head can be fun, just have to look up the tides beforehand so the beach isn’t mostly submerged when you get there.
Definitely co-sign on the 24hr in Kapolei. Lots of cruising in the shower stalls. Even the straight guys tend to jerk off in there and some of them like being watched…
I’ll have to check out UFC gym. I’ve been looking for one with a men-only sauna that’s open late.