Wasp,

Definitely plan on riding the Pantano River Park Trail. It's scenic and near flat, just a couple of very gentle climbs when you come out from under bridges. VERY gentle. Check out the blog post I did on it from when we were in Tucson in Feb. 2014:

http://travelingtwosome.weebly.com/t...teresting-park

Have a great time in Tucson. I love it there!