Long Island, NY
On Saturday, April 21st, The LongIsland Travasuns are having a swim night. It starts at 8pm at a gym in Wantaugh, NY. There is a pool, hot tub, saunas, steam room, and usually a volleyball game. Nude yoga, massage, and a beer/wine bar are extra. Check out Travasuns.org or hmu for more info.
Each event is a bit of a surprise when it comes to the amount of young people attending. Some months it's a handful and others more like twenty. The majority of people at ANY nude event tend to be older. Yes, there are straight people and yes there are gay people. There are white people and people of color. The point is everyone is welcome.
You asked if the attendees are attractive. In the first place beauty is in the eye of the beholder. More importantly these events are about nudist recreation and socialization; not about hook-ups.