I have been there twice. First in 1972 or 1973. The next time was in July, 2010. Both times, the museum was fabulous. It's just amazing how much is there. The campground was adequate (stayed there both times). I had to be pried away from the museum both times. As a teenager, my folks had to threaten to leave my brothers and I behind with our cousins, but Grandpa was just a taken with the place and he pled our case. The last time, my dear wife simply took a seat and read until I was done. Spent two full days and thoroughly enjoyed it!