Shaping San Francisco Bicycle History Tour: Ecological History (South)

From SFBC:
This 4-hour social, critical, and historical bicycle tour through SF's lost sand dunes, ponds, creeks, and coastline will focus on the City south of downtown and SOMA, including several new public parks. Sliding scale $15-$50 to benefit Shaping SF, but pay what you can/will. Info: 415-608-9035