Sail under both the Golden Gate and the San Francisco/Oakland Bay Bridge- in one spectacular cruise along San Francisco's entire urban skyline. See remarkable landmarks such as; Alcatraz, Coit Tower, the Ferry Building, Transamerica Pyramid and the Palace of Fine Arts, just to name a few. Discover the city's unique natural history, architecture and Native American culture through this audio cruise. Learn about the building of both bridges, the geology of San Francisco Bay and the earthquakes that have shaken the city and require special seismic considerations in the designing of new structure. Enjoy free time and lunch on your own on Pier 39 before the cruise. Register by June 9; call for availability after that date.