|Image via http://www.sandiegomuseumcouncil.org/museum_directory/san_diego_air_and_space_museum/|
With the money you save on admissions, you can take the Old Town Trolley Tour to your desired destinations.
A- Old Town Start
B- USS Midway
F- William Davis House
J- Balboa Park
The tour starts in Old Town at 9 a.m., and the the last pick up is at 4:25 p.m. After the tour, have an early dinner at Cafe Coyote in Old Town while listening to a mariachi band. You might just catch a balloon artist for the kids :)