If surfing is your thing, I suggest you try Cloud Nine Beach. I was over there with my friend Dick, who is an experienced RL surfer and he described the virtual version as ‘fun, fun, fun’. Beach Boys fans look away now. 🙂
Cloud Nine does come up as a ‘naturist’ sim in search. We were the only ones there, so I’ve no idea just how much or how little the sim readily embraces naturism, but we gave it a shot anyway.