I had the pleasure of running TSFM in 2010 (unknowingly pregnant), and on sub-par training, and I loved it. Having never been to CA before, let alone SF, I was ecstatic when I learned that the course weaves its runners through some of SF's most acclaimed areas. The first half gives runners the enviable opportunity of running over (twice) the Golden Gate bridge, among other 'hoods and spots throughout the city, and the second half is WICKED WICKED WICKED fast; I'm talking you-might-trip-over-your-feet-because-you'll-be-flying fast. Of the 21 marathons I've run, TSFM totally stands out to me, and I can't wait to dominate the streets in July--this time, not pregnant, and with on much better training.