@Lizzie:
Tucson is an amazing area in that it does not matter what a person's likes/dislikes are, there is some activity here for them to do. When someone asks me to recommend something I always start with, "What are your interests?" and point them to several items.
If I had a top five things I would do if visiting Tucson they would be these items that are unique to our area:
1. Pima Air/Space Museum (3rd largest air museum in the world)
2. Saguaro National Park (the huge saguaro cactus grows nowhere else in the world)
3. Titan Missile Museum (Titan II missile still sits in the silo and guests can go into the command center)
4. Old Tucson (Huge movie set/lot where many of the old Westerns were filmed)
5. Kitt Peak National Observatory (spend a night looking at the heavens).