Did you know that you can use the Golden Gate Bridge as a thermometer? Or that flags flying at different heights along the San Francisco skyline might double as a wind observatory? The Outdoor Exploratorium features a collection of 20 outdoor interactive science exhibits and artworks. Dotted along the waterfront at Fort Mason Center and in the adjoining 55-acre National Park of Upper Ft. Mason, these exhibits harness the wind, the waves, marine life, and the man-made and natural environments in this urban waterfront site. Maps are available at Fort Mason Center, Buidling A. Open seven days a week.