They may require a plane, train, or boat to reach, but once you arrive, 2 feet will be enough to enjoy these worldly fitness adventures.
For a side of San Francisco most people skip, cross the Golden Gate for some of the most beautiful views Marin County has to offer.  The self-guided Wine Country Trekking trip explores the trails around the birthplace of mountain biking and home to the country’s oldest cross-country event, the Dipsea race…

From “Run the World with These 9 Races” in Shape.com (April, 2014)