This past Saturday was Walk SF's Peak to Peak, an annual hike from West Portal up ~15 of SF's hills, ending at Coit Tower on Telegraph Hill. It was billed as a 12-mile walk but one participant's GPS-enabled cell phone recorded it at 14.9 miles, with something like 4,500 feet of climbing, if memory serves.
I had an absolute blast, although my walk to work today was a bit slower and more stiff than usual as I recover. Take a look at the photos above for an idea of how beautiful, and worth the pain, the walk was. Here's a map of the route annotated with some of the photos I took: