Besides the North Rim of the Grand Canyon (which is wonderful) consider a visit to Lake Powell. There is a wonderful RV camp at Wahweap marina out of Page AZ and also beach camping at Lone Rock off Hwy 89 just into Utah. At this time of year Lake Powell will be busy, but if you have a chance to get out on the lake, it is an experience you won't forget...
Also Glen Canyon DAM has an interesting tour and visitor facility.
All the best on your tarvels!