The USS Bowfin Submarine and its museum feature an entrance fee for visiting them. If you have the Go Oahu card, the fee is included as long as it has been activated for the day. The people at the USS Bowfin will take your photo and put it in an old newspaper. If you purchase this souvenir, you’ll also get a free cultured pearl from the nearby pearl jewelry purveyor. The salesperson will ask you choose an oyster, open it in front of you and tell you what kind of pearl you found. We got a black pearl. Click for more on Pearl Harbor. Click for photos of the USS Arizona Memorial, and click for links to more content about Oahu.