Yesterday I went running in Golden Gate Park, which is about two-three kilometres wide and stretches seven kilometres from the sea into San Francisco. This is becoming something of a tradition for me when I go abroad - last weekend I ran in Hyde Park. The idea is that I see more of the city and its locals and have a decent shot at not deteriorating physically when on vacation.
It turned out there was a nice beach on the coast, so I got to dip my feet in the Pacific Ocean just like I did when going to Australia for studies in 2005. I appreciated the symmetry of doing the same, but from the opposite side.
You can see the track of the run on Endomondo: http://www.endomondo.com/workouts/utWNA_j1dj0
I ran a bit barefoot on the beach and had a conversation with a girl who considered doing the same, but wanted to avoid blisters on the trip home. Yep, genuine interaction with locals! I think she thought me a local as well until we had exchanged a few words.
Preliminary verdict on SF: It's fantastic. (Picture Steve Jobs saying it.) Faaaan-tactic!