Since we are already going to be out there, we are going to take a couple extra days on the way back and see a bit of the country.

What are the must see sights in Utah, Nevada, Colorado or Arizona?

We are kinda thinking of making a big loop or zig zagging through those states somehow. Right now the list is penciled in as:

Las Vegas strip at night
Grand Canyon (is North or South side better?)
Arches National Park
Rocky Mountain National Park

Where would y'all go? Oh yeah, I'm trying to do this on a shoestring budget.