Definitely go to the Grand Canyon--either North or South. There is no other place on earth like it!
We have been 4 times over the past 16 years.
The north rim in 2007--with a 37 foot 5th wheel we stayed at a rustic RV Park near Jacobs Lake that is still there with full hookups. Yes it is 40 miles to the North Rim one way--we did it several days. We also got a NF map of the area and drove on NF roads to the rim--a really great experience with the September colors in the aspens.
Next trip a few years later, we spent about 5 days on the south rim again in the fall. Helicopter trip across the canyon with a DVD of our flight with our voices on it. Great Ranger shows, campfires, stayed at the RV park on the South Rim.
In 2016 we took a 6 day float trip for 188 miles thru the Grand Canyon. There is virtually no description of that trip--Western River Expeditions was our outfitter--all meals, water, tents, cots, bed rolls were provided along with river guides who knew the geology and history of the GC. The trip was just wonderful in August. We left our 5th wheel in Page, AZ.
Last trip was in 2018, in September, and we stayed 2 nights at the Lodge on the North Rim. It was again wonderful. Tour buses arrived everyday for about 18 hour stay. The tour buses did not go to any overlook away from the Lodge. We went to the overlooks--along with about 4 other travelers! No crowds. We left our 5th wheel in Kanab on that trip and just drove out truck to the park.
Any questions, send we a message.