RVParky shows 2 north of Williamstown, Camper Village RV Park and Northern Kentucky RV park. As far as how much time to spend at the Ark I would say a good 3 to 4 hours and it could be more if you take in everything. I found our trip there to be quite enjoyable and we spent 4 hours including lunch. The structure itself is impressive. One building wasn't open yet when we were there and I guess it was going to be a show of some type. We stayed in a motel though and didn't camp so I can't tell you anything about the campgrounds.