The meeting point for cycling in San Francisco is at the visitor's center parking lot on the south side of the Golden Gate Bridge. Every Saturday and Sunday morning.
There, numerous cycling clubs, triathlon clubs and bike-racing teams gather south of the bridge, assemble their group rides, and head north across the Golden Gate Bridge and into Marin County, where the city of San Francisco is left behind for the natural beauty of Golden Gate National Recreation Area, Mount Tamalpais State Park, and more.
"Everybody meets there," said Dylan DiBona of Mission Cycling Club. "All the different club rides from 7:30 to 10 (a.m.) all meet there. A triathlon club, or a cycling club or team. Everybody, at some point, has to go through there. So you can meet groups and groups and groups of people. It's the easiest way to fall in with somebody."
In many ways, the Golden Gate Bridge is the landmark of San Francisco, and active people in the Bay Area don't forget that. Neither should active tourists. The bay side of the bridge has a walkway available for pedestrians, while both sides are open for cyclists at certain hours.
But the Golden Gate Bridge and the areas it connects are only one small possibility in a vast array of options available to active people visiting San Francisco.
Here are some more ideas to keep your heart pumping, whether it's on your feet, on the bike, in the water or on the trails:
More: How to Stay Fit on the Road