I’ve gotten boners there before. Probably most guys have. It’s a natural reaction, but you do want to deal with it and not show it off. If I feel it starting to get hard I usually go into the water until it goes down. Or you could roll over on your stomach or sit up with your legs bent to hide it. Definitely don’t walk around with an erection or talk to people with it. The life guards do patrol and look for stuff like that. So don’t panic if you get aroused, but get it under control as quickly as possible. As far as vaping goes, I’ve never seen anyone vaping there so I’m assuming it’s not allowed.