Rillito River Park Trail
This 11-mile hiking trail throughout Tucson is located along the Rillito Riverbed. Hikers can enjoy the trail in its entirety, or access the trail through various points along the way. The trail includes a paved path as well as a decomposed granite natural path for the more experienced hiker.
http://www.pima.gov/nrpr/parks/rillito_riverpark/index.htm.