Well, shit. Here you go. When I lived in Phoenix, I came up with this list of activities to do with a friend when they would visit.

• Mexican food (it’s everywhere and it’s better than where you live unless that’s LA or Mexico)
• South Mountain is fun to drive and see at night
• Zoo is a good one especially when the heat isn’t bad
• Renaissance Festival is going on but it’s a drive out there
• Spring Training is likely going on
• Ostrich Festival is sometime in March (Chandler)
• Soleri Bridge
• Hole in the Rock
• Love sculpture 
• Goldfield ghost town
• Wildlife World Zoo
• Tovrea Castle tour
• Bed of Nails (AZ Science Center)
• Rosson House
• Biltmore (hotel)
• Japanese Friendship Garden
• Four Peaks Brewery
• Durant’s 
• Carolinas
• Schnepf Farms (May)
• Cerreta Candy Co
• Compass Arizona Grill (restaurant, get a window table 30 min before sunset)

Some of these are specific to the part of town I was in. Hopefully this helps give a couple ideas.