Musem of Contemporary Art San Diego: Free admission for those 25 years of age and under; annual student membership for $35. Locations both in La Jolla and downtown San Diego.
Balboa Park (student admission listed unless otherwise noted)
Various park organizations offer free admission on rotating Tuesdays, see the schedule at Free Tuesdays.
Japanese Friendship Garden: $2.50
Mingei International Museum: $4
Museum of Photographic Arts: $4
Museum of San Diego History: $4
San Diego Air and Space Museum: $12
San Diego Automotive Museum: $5
San Diego Hall of Champions (sports museum): $6
San Diego Model Railroad Museum: $3
San Diego Museum of Man: $7.50
San Diego Natural History Museum: $8
Timken Museum of Art: Free for everyone