Wandering minds

As I draw closer to picking up my Rialta RV, I find my mind wandering about North America. I’m accomplishing this mostly via the internet because I’ve really never traveled the interior.
Other than some business trips to Dallas, Provo and Las Vegas I’ve never been any place in the U.S. you couldn’t reach by boat. Well, Vegas wasn’t really business. It was a small detour along the way.
I want to visit some national parks and I’d like to travel mostly on non-interstate highways. Ok, I probably will opt for interstates in certain areas due to environmental concerns like crossing a desert in the height of summer. Research may prove me wrong though.
Keeping in mind that I want to visit places where I can stay for however long it takes to capture some good photographs and also get to know the folks, feel free to send me your ideas.
Ciao