First come, first serve campground at one of the more underrated parks in the National Park system, with 13 sites (one is handicapped accessible). I've seen other reviews saying that you need to get here around mid-late morning to grab a site, but we ended up being the only one there the morning we arrived, and only two other sites a night ever filled up while we were there. Since we visited in mid-July and was extremely hot, it may depend on the season so be prepared--if everything is full, there's an "overflow" boondocking area at an abandoned airstrip just west of the park on Highway 39 that the rangers typically recommend.
Park is dead-quiet at night, with a complete dark sky so you can leave the rainfly off if the weather is good. Some sites have two tent pads, so that's something to consider if you want to set up a tent just for the kids or have a larger party (up to 8 people per site).