Shuttle isn't free anymore--$6.00 per person. I just got back home from Mt. Rushmore KOA (Palmer's Gulch) and I didn't care for it at all! camp spots too close together and it was packed, noisy, atv's running around everywhere just didn't like it at all!
BUT--very close to Mt. Rushmore, easy 5-10 min. drive to park, people were all friendly, still has cheap breakfast--all you can eat pancakes, and lot's and lot's of things for young kids to do!