The campground boasts 20 sites but a 1/3rd of them are Day use only. Half are by reservation and only 3 are first come, first served. It was a lovely spot, easy to access and the camp hosts were very nice. A creek runs by the campground and there are several trails for hiking, including one across the main road that goes pretty much straight up a hill but offers an incredible view of Mt Rushmore.
No Rvs are allowed but if you are camping in a van (or Jeep in my case) you fit in just fine. There are lots of trees appropriately distanced for hammocking.
There are no showers at the campground but you can head into Keystone (7 min drive) and there are showers in town.