I'd suggest a loop that includes: Colorado Rockies, Tetons (Jackson, WY), Yellowstone, Bryce and Zion (UT), Grand Canyon - DO NOT SKIP THIS, it is the single most spectacular place in the US of A. Might want to see Chicago on the way - nice art museum and pretty lake front. Maybe Philadelphia, NYC or DC on your way home.

Better get started. Alot of traveling to get done before July.