Endangered Species Big Year Bike Tour

From SFBC:

Bring the 2010 Golden Gate National Parks Endangered Species Big Year to a close with a great bike ride to observe some of the imperiled plants and animals clinging to survival in San Francisco's wild northwestern corner. The ride will start off searching for Humpback Whale, Steller Sea Lion, Southern Sea Otters, and Marbled Murrelet at Lands End, then ride through the Presidio to discover the San Francisco Lessingia and the strange story of the Gowen Cypress. The last stop will be at the Crissy Field Wildlife Protection Area to check in on the Western Snowy Plover. Bring food and water; RSVP required, sign up online.