Camelback Mountain is a local favorite both because of it's close proximity rnand it's beautiful views once you reach the summit.
For those into rocks, here's a little history. The head part (where the trail starts) is 70 to 100 million years old and made of ancient brecciated sandstone.
The hump is Precambrian plutonic granite about 1.5 billion years old that has been uplifted and eroded. The fact that these two joined at the "neck" is just a coincidence.
Summit Trail is a little over 1.5 miles each way, but it's a 1300 foot gain in elevation, so it's a little steep.
Going up will give you a good aerobic workout, especially scrambling over large boulders, but the going down is when you find out what your knees are really made of.
Mine started complaining part way down, and continued to whine for days afterwards.