From the SFBC:
Beginning this Saturday, Healthy Saturdays returns to Golden Gate Park for six months (April through September). Healthy Saturdays is an abbreviated version of the full Sunday/Holiday open-streets program in Golden Gate Park when JFK Drive is open to bicycling, skating, walking and anyone wanting to enjoy the park. Learn more about the SF Bicycle Coalition's successful work on Healthy Saturdays at sfbike.org/ggp.