I mean, all of southern Utah, right? Moab would be phenomenal, but I've never been. But it does seem like a great base to see a lot of places. Off the beaten path, I have heard good things about Great Basin National Park. Apparently well worth the status of a NP, but very few visitors as they all go to Zion/Brice/Arches.

I like the day tripping out of St. George. Zion is a favorite spot of mine, I have always wanted to do the slot canyon's in Kanarraville, and then I forget the name, but the canyons NW of St. George are supposed to be nice.

Then Great Basin NP, maybe a day trip over to Bryce so you do not drive the MH over there, up to Moab.

Hmmm...from there I would be awfully tempted by Colorado, just start looking up Waterfalls, hot springs, and all the national parks. Beautiful state. Or, up to Grand Tetons/Yellowstone.

Just some random thoughts....