If you are a Passport America member and cost is a factor in where you camp, then Lake Aire would be an alternative campground. With PA it is $27/night vs $44/night at the campgrounds mentioned in previous posts. Not as nice as JCIP & OP, but if you are there to sightsee, then you will be out of the campground all day anyway.
Lake Aire is a private cg, so you will see a number of extended stay customers there. We never had a problem with any of them and they seem to stay to themselves.
We have camped at JCIP in the past and liked it, but is is difficult to get a reservation there.
2008 40ft Tiffin Allegro Bus
2014 Honda CR-V AWD