Great campground at Devil's Tower, inside the park gates. Sites are first-come, first-served, but we were there three nights and there was always at least a couple of sites free. Most have some shade. Modern toilets were clean and maintained (no showers though). Sandy the camp host was attentive and lots of fun. And you really can't beat the view! Definitely would go back. One of the best campgrounds we've stayed at, in one of the coolest locations!

Side note: The Devil's Tower View store and restaurant nearby has good food and sells beer and drinks at reasonable prices--DO NOT buy your beer at the KOA store or the DT Trading Post ($17 for a six pack!!! No thanks).