I would go into SNA (Orange County) in the city of Coasta Mesa. You can fligh in on Southwest which have good fares. I would use dollar rent a car, don't know about the under 25 thing. I have been to all of the major airport in southern cal and SNA is definantly your best bet. I flew in there 5 times this year, no wait time. I would use priceline for a hotel, stayed in the Grand Hyatt two weeks ago in down town San Francisco for 50 dollars a night. So Orange County should be much cheaper than that. Traffic on Friday will be bad, so I would go to KBF on Friday and Saturday and MM on Sunday