San Francisco Bay Area Transit Information http://www.transitinfo.org/ is available on the Internet.
The Golden Gate Transit bus and ferry system serves Sausalito and Marin County. Some Golden Gate Transit buses run between downtown San Francisco and the Bay Model in Sausalito. The nearest bus stop is about two blocks from the entrance to the Bay Model at the foot of Easterby on Bridgeway.
From the East Bay you can take a Bay Area Rapid Transit (BART) train to the San Francisco Embarcadero station, then take a ferry or bus to Sausalito.