Catalina State Park has an assortment of trails for all energy levels. From the park, the hearty can hike clear up into the Santa Catalina Mountains, sleep out in the open, and walk for miles.
For less stamina, my favorite trail is 2.6 miles and loops through the desert plateau down into a small canyon with a little creek-- a creek that is perfect for wading or sitting on a rock and meditating.
Because we were later than last year, I expected to find no wildflowers but there were plenty to admire along the trail. On the ridge above the creek canyon, the trees were just starting to leaf out which seems to indicate, to me, that Tucson is also having a late spring. No complaints from me.