FrogFly said:
Anyhow, if you're in Old Town, go to Casa de Pico (sp?) and eat some of that good food while drinking margaritas from a fish bowl. It's nice...
From a college student's view hear are a few pointers.
1. If you are not 21 San Diego will get boring. Underage persons should go to Tijuana. Hickies and other wounds sustained in TJ will heal after a week so GF's will never know.
2. San Diego Zoo sucks, go to Wild Animal Park if those things interest you.
3. Restaurants
Downtown: Monsoon on 6th Indian, ask for Michelle, tell her John sent you, she hot and will take care of you. It would be fine Indian cuisine.
Old Town: Like above. Casa De Pico has the Best margaritas hands down, not those sissy TX margaritas.

Better food at Casa de Bandini in the same area. Go to Pico for Drinks and Bandini for food.
PB: Lots of Clubs bars and what not. do not go to Plan B. It is plan b and it shows by looking at the people inside.
BEER:
I love BEER! If you are going to the beach area go to Mission Beach, the place is The Liar's Club it is on Mission Blvd. They have TONS of local brews which are fantastic. Ask for Lil' Devil by Alesmith.
Surfing:
Blacks Beach is Number ONE. Caution it is also a Nude Beach. Point Loma is where the Seasoned surfers also go, but Ocean Beach and Pacific Beach are decent as well.
Fast Food:
No Doubt you are not going to eat at nice places much if at all. so quick serve places to remember when wandering around.
Roberto's: Open 24 hours great for hang overs and recovery. Carne Asada fries or Chimichanga.
In 'n Out: Great Burger place but it was mentioned already. Ask for your burger Animal Style.
Kono's in Pacific Beach. Go all the way down on Garnet towards the beach. At the end of the street and on the right is Kono's open for lunch and breakfast only. Enjoy.
See if you can get a tour of BUD/S. It rocks. They'll let you do most of the O course. Have fun with "Dirty Word."
Cabrillo National Cemetary/park? is also open if you want some time to reflect. It is at the tip of point Loma.
I can't think of anything else. SD guys correct me if I missed anything.
John