Schnepf has a coaster out there? I had no idea. Gotta head out there post-haste, it's a good place.
It isn't 110° in May around here! Those temperatures wait until at LEAST early June!
Oh, while in Tucson, an absolute must for food is Cafe Poca Cosa. Best Mexican in the state, hands-down. Get the Plato Poca Cosa; you'll find out what you're eating when it hits the table. I get it every time I go, and I'm always thrilled. They're in the middle of summer vacations, so one or the other of their two locations (about three minutes walking from each other) will be open. Either way, stellar stuff.
If you need to beat the heat, go up Mount Lemmon and do their ski lift skyride. You'll ascend nearly 6,000 feet in 45 minutes of driving, then another 900 feet on the lift. Once you're down off the lift, go around to Summerhaven and stop in Cookie Cabin for one of their cookies. They're nearly as big as your head.