USS Midway Museum

Located in the Embarcadero section of Downtown San Diego is a giant Aircraft Carrier that you can't miss, the USS Midway.  It has been turned in to a museum since it was decommissioned in the 90's showcasing life on an aircraft carrier in the US military.  When on board, you'll be able to get tours of the various sections of the ship, from the engine room to the bridge to the actual jets themselves.  You even have the opportunity to hop into one of the jets and to also partake in a flight simulator.  Also, from the top of the ship, you'll get a gorgeous view of downtown San Diego.

This is a tour I'd highly recommend at a cost of $18, although there are various discounts available, including free admission for active military members. However, leave plenty of time to explore the many areas of the carrier as you can spend all day here.

Also, right outside the museum, you'll see a statue that is several stories high showing a classic pose of a sailor kissing a girl right off a boat after returning from war!