San Diego is a great city for biking. If you live near campus, biking is a great way to get here. There are lanes reserved for bikes along several major roads in San Diego, and there's also a dedicated bike path that takes you from Gilman Drive to Pacific Beach.
The Bike Shop is a good resource.
Pedal Club is a terrific program is available through Ride Share and the Parking Office office. If you bike to work 3 times a week and have registered your bike with the campus police (This costs $6, and can be done at the Bike Shop or police station), you can obtain a free 10-day-per-quarter B-space parking permit (Worth $40 or more).
See also the main Transportation page.