Coming from South on the I5:
1. Head north on I-5 N
2. Take exit 27 for Gilman Dr
3. Turn left at Gilman Dr, and follow Gilman into and through campus for 1.8 miles
4. Turn left at Scholars Dr S and follow to parking lots

Park in the lots at the intersection of Scholars Dr S and Revelle College Dr. (Paid parking)
Walk North to "Ridge Walk" and look for Bonner Hall on your Right.
Google maps link