The writer and frequent NPR commentator David Sidaris has a hilarious section in one of his books (I can’t remember which… sorry) about his visit to a nudist camp. I believe he also delivered that section in a monologue on This American Life.
From his descriptions of it, unless you have a fetish for very flabby middle-aged people, it isn’t going to be a problem.
As far as why go to nudist camps…
This may be TMI, but I’m usually naked at home. I think it’s more comfortable to not wear clothes. Now I personally don’t want to see anyone else naked or let them see me so I keep this within the confines of my own home but I could see the pleasure in going outside naked, feeling the comfort of nothing restricting you at all. And if you don’t care about other people seeing you and you seeing other people, great.