Custer State Park is a must. There is enough to do there to spend a week. Grace Coolidge campground was fine - quiet and clean, with a bike path that connects it to the convenience store and Lodge (useful for internet access + laundry + restaurant). Our site (10E) was located along the stream, which made it quite bucolic.

The Custer State Park Grace Coolidge Campground is located on US Highway 16A. In this video, I give you a walking tour of the Custer State Park Grace Coolidge Campground. I show you the best campsites and other campground amenities. I did not find a dump station or fresh water fill at this campground. A speed test failed for cellular service on AT&T, and there was no cellular connectivity for both Verizon and T-Mobile at this location.

Of all the campgrounds at Custer State Park, this is my favorite. It is centrally located near visitor centers and park restaurants/bars, hiking trails, and a short distance to the single dump station and water fill. Campground has beautiful shade trees, the cleanest & nicest restroom/bathhouse you will find at any campground, electricity pedestals, grills & firepit. Gravel pads were level, plenty space between campers. There was a 3 mile paved bike/hike trail that originated at Grace Coolidge. A herd of bighorn sheep came through the campground almost daily. The other nice campground within Custer is at Sylvan Lake, but it's fairly remote from most of the park. Sylvan seemed to have a great selection of hiking trails. For cell service, take a short drive up the road to Pavillion or Visitor Center.