Nobody walks in LA.
I voted for SF because it's my hometown and I love being a tourist there: Fisherman's Wharf, Pier 39, Alcatraz, Ghirardelli Square, GG Bridge, GG Park (De Young Museum, Academy of Sciences), Cable cars, the baseball stadium (does it have another new name, yet?), Lombard Street, The Haight, etc...
Also, I see you are in Jersey, so you would get to see the whole country on your way.
MotionMan