The feeling I get from being on a nude beach is complete and total freedom. It's indescribable. I walk around freely as does everyone else. You sometimes see a hard cock, but not too often. If anyone is flaunting one, they get shunned by the regular nudists pretty quick and girls will give them dirty looks. I've had an erection a couple of times and I just roll over onto my stomach until it's gone. Once I was asleep and woke up to a raging hardon and noticed a couple of girls looking and smiling at each other. I rolled over, but later thought I should have just let them have a better look. ;-)
Some beaches have a gay section where a lot of single guys (and groups of guys) hang out on. I haven't seen any overt sexual behavior, but I haven't really looked for it.
It's amazing how friendly people are on the beach and how natural it feels. I used to hang out with a massage therapist at the beach and she would give me massages. Once she asked me for a massage when the beach wasn't too busy. I had a major hard on for most of the time. I kept pushing it down between my legs and keeping my legs closed to try and keep it down, but it was pretty visible. When the beer girl came along she gave me a smile as we talked a bit. I had leaked quite a bit of precum by the end of the massage. I couldn't help it since I was massaging all over her butt, brushing against her pussy, and on the sides of her tits.