Enjoy two separate adventures on san francisco bay with this combo experience that includes an alcatraz tour inside the world famous prison and a sightseeing cruise by rigid hulled inflatable boat rib travel across the bay from pier 33 on the alcatraz ferry to reach the historic island prison which youll explore with the provided audio guide featuring fascinating insight into life on the rock then after your return to san francisco walk down to pier 33 for your 90 minute bay voyager rib