If you are looking for something "NOT" KOA, we really liked the Stockade Lake North campground in Custer State Park. Just outside the town of Custer and close to all the attractions. Best of all is you are in the middle of one of the best wildlife areas around. Look it up here:
https://www.campendium.com/stockade-...rth-campground
Let me know if you'd like more detailed info.