I spent three months in Tucson this winter. My favorite place to visit is the Arizona Sonora Desert Museum. It is a combination zoo, botanical garden, aquarium, mineral, and natural history museum.
My favorite thing to do at the museum is the Raptor Free Flight. It is a lot of fun having hawks, owls, falcons, etc. flying inches over your head. I often have my head brushed by a wing as a bird flies over. This gallery contains photos of the Chihuahuan Ravens, Crested Caracara, and the Red-Tailed Hawk.