We stayed for 4 nights in walk in site 21. It was bit interesting to get all our stuff to the site, and thank goodness we had 2 wagons and teens to help carry. It was a great private site, allowing for a good size tent and 3 hammocks. Easy access to the West Rim trail which was a terrific hike. Waterfalls were dry, which was disappointing but the hike to them from the West Rim Trail was quite pretty.
Note that the Visitor Center had no wood left, having arrived on a Sunday. We saw a sign for wood delivery and called Mac. He was very accommodating, delivered wood within a couple of hours to us in the parking lot. A great price! Call Mac at 423-596-4805.
All in all we had a great experience.