Sahuaro Ranch Park is a lovely place to take a breather. Have a picnic, amble around the grounds or just lie on the grass and close your eyes for a while.
You're spoiled for sightseeing choice in Glendale. Sahuaro Ranch Park is a good place to begin here, but there are many other fine places to discover. State Farm Stadium, Peoria Sports Complex, and Desert Diamond Arena are near the recreation and green space and will top off your day nicely.