Sorry to hear about the additional surgery.
You can get good mileage on the flat paths adjacent to canals. (There are some that are closed, but many are open specifically for walking and biking. Some even have specific traffic-controlled crossings, bridges, or tunnels.
Another option is mall walking.
http://www.azfamily.com/story/28338210/ ... mer-months
Most malls open at 6am just for walkers!
The City of Scottsdale has a neighborhood trail system. There are nice paths that all the fancy developments have to build, and they connect with one another. The paths are open to the public, even if they go through a private, gated development.
Check out the master plan on their website for more details:
http://www.scottsdaleaz.gov/transportat ... ils-system
One of the most popular HAZ all-time favorites is the https://hikearizona.com/decoder.php?ZTN=114