Glacier, Yellowstone, Badlands among other highlights on one trip. White Sands, 4 corners, Carlsbad, Great Sand Dunes, Mesa Verde on another. Took a lot of trips out west. Still haven't been east of Odessa, MO by car other than up 35 to Duluth.
When I was little we had some pastureland with some ponds between Salina and Concordia several miles back on dirt roads. Go up there and stay in the camper and tents for a few days. Wouldn't see anyone or hear any vehicles. Fishing, exploring, camping. It really was a great time. Simple, cheap fun.