If you like being on the bay, you've got to try the USS Potomac. They have 2 and 3 hour cruises (sometimes themed) every week from April through November. The ship was FDR's presidential yacht from 1933 to 1945. In the 50s, 60s, and 70s the ship gradually declined until it was running drugs and sunk to the bottom of the bay at Clipper Cove. The Port of Oakland rescued it, In the mid-80s the ship was restored with public and private funds to its former glory, and has been taking locals and tourists out on the bay since 1995. All cruises are narrated by knowledgeable historians. Trained Docents give thorough tours of the entire ship, and are eager to share stories about FDR and the depression/WWII years. You can go out on the bay on Hornblower Cruise or a ferry boat, but there's nothing like a cruise on the bay on the USS Potomac!