If you like mexican food, the absolute BEST place in town is the Old Town Mexican Cafe. Pretty near the airport if I remember, I go eat there every time I go out to visit my uncle with alzheimers (sp?) in La Jolla, and it never gets old..
Just down the street from it is a neat little park that has an old Mexican villa and some cool vendors and an little open air market.
mmm carne asada...