Not much. Had a blast in San Francisco. I saw the Monterey Bay Aquarium, which is exactly where parts of Star Trek IV were shot (creepy cause I completely forgot about that until I got home and watched the movie again). I saw the Coit tower (from afar) and did the 'Crooked Mile'. I also saw Alcatraz and did a tour of it. Pier 39 was fun too, my parents said that I am a shopping machine. I had them out till 11 pm there, and they usually call it a night no later than 7-8 pm.
Let me just say that my interest in it is piqued enough to do something with [Alcatraz] as a D20 product.
I also got to see and hang with a very good friend that I hadn't seen in about 1 1/2 years.
All in all, it was very fun.