This review is of the campground, not the museum (which we didn't visit).
Although we planned to arrive here on a Sunday and stay two nights, we were ahead of schedule and called to ask if we could extend our reservation by arriving one day early to stay three nights, and were told that it was just fine. When we arrived our campsite was ready.
Our Tiffin Allegro has a dishwasher, which we ran shortly after our arrival. When that load was done, we were surprised to discover a film of calcium on the dishes and on the walls of the dishwasher itself. A second load the next morning made the situation even worse. (A week later, there is still a lot left).
On the upside, after deciding that we should move on to our next planned stay, we called to ask if we could cut the visit short and get a refund for that the third night and they credited us for that night.
Other than water that is apparently hard as a rock, this campground might deserve three stars, but I can't imagine why some of the reviewer awarded it four and five stars. It ain't anything special. Gravel, water, electric, sewer, and packed in like sardines -- $40 a night? Maybe they were rating the museum.