We have stayed here a few times on a trip to or from the west coast. It is not far away from freeway I90.
It has never been crowded when we were there in spring or fall. Big campground, clean and tidy, in an open are with few trees. Shower building was OK. Park Visitor Center is nearby.
We took the cave tour on one visit. Nice guide. You slide down a rock at one point that has been smoothed by the passage of many.