Ecological History (north) Bike Tour

"This trip through San Francisco's lost sand dunes, ponds, creeks and coastline will focus on the city from downtown north, covering the heart of the city, the waterfront and Yerba Buena cove, Telegraph Hill, Black Point, and Crissy Field in the Presidio... It's a social, historical and critical 4-hour tour through the city's ecological past and present."