Actually, many lewd conduct arrests occur around the fringes of nude beaches and frequently LE has undercover (clothed) officers stationed there.
I'm not familiar with all of them, but we didn't have a lot of problems with the ones I've visited in Oregon. Part of the reason that there were arrests is that the legitimate lawful users of those areas were vigilant in making sure law enforcement officers were called in to deal with unsavory types.
I would imagine that unwanted actions on the part of those who deem the locker room or the latrine to be pick up spots will be dealt with swiftly and surely.