Alex,
Beloved Spouse and I have the opposite problem when traveling in Blighty; remembering that the distances are so short!
As others have said, Arizona alone is not a very big state, but it is still larger than UK. What to do? Pick two or three sites and have a great trip. The Grand Canyon is probably a "must" but consider cliff dwellings like Mesa Verde.
Then relax, you can't see it all. So come back again when you can spend more time. The good news is that prices are generally lower than in UK.
Have a wonderful trip!
