Shopping, dining, general fun things to do?
I have spent a lot of time in San Diego and these are some of the things that I really enjoyed doing.
Point Loma tide pools and many other things : http://www.nps.gov/archive/cabr/lighthouse.html
Old historic district of San Diego with cute shops and good food: http://www.oldtownsandiego.org/
Coronado Island and the beautiful beach. Visit Hotel Del Coronado:
A cute surfing town. Lots of beach shops, roller coaster and simulated surfing, bike rentals etc:
And the zoo: http://www.sandiegozoo.org/