Please be aware of the new arrangements for paying tolls to cross Golden Gate Bridge into San Francisco. There are no manned tolls open on the Plaza it is done by license plate recognition - instead you are required to purchase a One Off payment beforehand or on line up to 48 hours after crossing the Bridge otherwise if you have a rental car the Rental Company will pay the toll and add a convenience fee!  Leaflets explaining this new system are available at the Airport but some rental car companies do not advise about these changes.