Hiking there is lots of it - but these are my top 3

7 Falls

All I can say is what a great hike! and if there is water up there even that much better, very refreshing to go for a swim or just enjoy the view of the 7 waterfalls. Check out the site here.

Blackett's Ridge Trail

A great hike that takes you high above Tucson. Not a loop you go up and you come back down the same way. but what a view! Check out the site here.

Tumamoc 

Located on the west side, is this quick hike on a paved road total 1 hour round trip with very steep switchbacks. I get a great workout everytime! Check out the site here.