I recently spent some time in Southern Arizona with my family. We hiked in Picacho Peak State park, which is on the highway between Tucson and Phoenix. Early spring (late March and early April) this park explodes with wildflowers. You can also go up to the top of the peak but you have to do some scrambling with cables stuck in the rocks and such. Lots of fun. I took a few pictures there that I'd like to share. The time of day wasn't entirely right for good light, but I still like them. Much larger versions are available in the links underneath the images.
Lupine, Poppies and Saguaro:
Poppies and Saguaro skeleton:
Sea of lupine, Saguaro and Picacho Peak
Sea of flowers: