There are so many amazing locations for portrait sessions in the Bay Area. Choosing a spot that is meaningful to you is a good starting point. Beyond that it's good to think about what fits your personality best -- beautiful architecture, the beach, a golden field, flowers, wooded areas, something with more of an urban feel, perhaps?
I have photographed in hundreds of locations. Some of my favorite areas are listed below.
Crab Cove, Alameda
Jack London Square, Oakland
Joaquin Miller Park, Oakland
Henry Cowell Redwoods State Park, Felton
Baker Beach, San Francisco
Palace of Fine Arts, San Francisco
Golden Gate Park, San Francisco
Mission District, San Francisco
Legion of Honor, San Francisco
San Francisco Marina