10th time across USA need ideas

Have you been to Kartchner Caverns in Benson AZ, or the Cochise Stronghold? Kartchner is one of the few living caves in the US but you want to get there before July. They close half of the cave due to it's being a nesting cave for bats. Cochise Stronghold is a small mountain range that caused the US Cavalry a lot of pain during the Apache Wars. Lots of hiking, 15-20 miles of AZ dusty roads to get there and dry camping only. If you decide to visit do not take your RV to the Stronghold. I'm going to assume that you've been to Moab UT and the surrounding state and national parks. If not that would be worth a 4 week stay. Have you done the Cabot trail on Cape Breton Island? We did that one on a motorcycle. Prince Edward Island is a joy if you haven't been there. You can drive over now, we had to take the ferry over. Have you done CA Rt 1 south the Big Sur, Hearst Castle Morrow Bay? What about Rt 1 North thru the redwoods and coastal Oregon and on into Portland the Seattle. Then take 90 (you didn't mention 90) east thru Spokane, and eventually Rapid City SD. You could spend a few weeks in the Black Hills and surrounding sreas. From there head to the Great Lakes and take some of the routes already suggested. There's always Duluth MN and points north (way north) Vince Shute Bear Sanctuary

Have a great time this year. We're heading to Alaska and most points in between plus the Arctic Circle this year.