If you're staying near SFO—on a layover, business trip or long weekend—there are plenty of places to get out and stretch your legs. Near the airport there are trails that go into the hills and along the waterfront. Old Bayshore Highway follows the edge of the water and is the closest to most airport hotels. Here the paths are well maintained and landscaped so it's easy to take off at full speed! Make sure to run durring the daylight hours only—and don't forget to tie your shoelaces.