We tried to stay at the Joe Skeen CG and it was full on a Wednesday. Searching further we found this spot. There are "no camping" signs once in the picnic area but nothing indicating no overnight parking or camping on the 3 spots near the TH for the Narrows Rim Trail. It was 7pm when we rolled in so we felt comfortable just staying the night in our van. In the morning we moved into the day use area and took turns doing the rim trail while our kids enjoyed playing in the picnic area. 2 pit toilets and garbage are available at this location.