Do u have to register for camp to take showers or open to public? And do u needs coins or quarters?

You don't have to register for camp to use the showers we went to rent a boat and after that we walked to the restrooms close to the campsites, tents only and we took a shower I don't know about the restrooms where the RV's are, and quaters only I believe it's 4 quaters for 3 minutes

Yes bring quarters! I believe it's 75c to start and for 10 mins then 25 c for every maybe 5 or 10 mins I can't remember But They do surprisingly get nice and warm!