The system of trails here allows you to choose whatever length trail you'd like so if you want to do a short one mile hike or a longer 5 mile meandering loop you're able to do that at the Sweetwater Preserve. Just keep an eye out for mountain bikers as this is a popular place for them.
For living so close to Saguaro National Park, I don't make it there as much as I should. The Park is split into two districts, East and West, on either side of Tucson. The East district is 10 minutes from my home.