It depends on your interests and your tolerance for heat. The Sonoran Desert (where Phoenix is located) is beautiful and there are massive parks with great trails. If walking is your thing, the Moon book Take a Hike Phoenix has detailed suggestions. Try walking around the Buttes in Papago Park. Climb Piestewa Peak. Go to Cave Creek park and walk the Go John Trail. Go to Pinnacle Peak in north Scottsdale. And stay at one of the JW Marriotts or the Biltmore. Go for a cruise on the Desert Belle on Lake Saguaro (but reserve in advance). Eat at the Red Rock Buffet at the Fort McDowell Casino. If you find a real Mexican restaurant - one that doesn't have food that seems to come from Costco, let me know.