Don't forget to look to the west of Phoenix. There are some great hikes in the White Tank Mountains. A combination of Goat Camp Trail and Willow Springs will give you an excellent workout and a variety of terrain.
It is a little longer drive to the trail head, but Quartz Mountain (also on the west side) is a great hike.
On the otherhand, if you go to the Superstitions as Daryl suggests, Flatiron will get your heart pumping and Reavis Falls is a nice hike.
Every day is a good day!! Some are just better than others.