Know Before You Go:
Screen a submarine thriller to get you and the kids in the mood. Try "Crimson Tide," or perhaps "Operation Petticoat." Claustrophobes might want to think twice about taking a turn inside this 30-year-old sub, as passageways are narrow and ceilings are low.
The Extras:
The submarine floats next to the Queen Mary; make a day of it at both attractions. Also withing walking distance is the Aquarium of the Pacific.