I just got home from a week stay in San Francisco and it was a blast.
We started our days at the new UN Plaza which is so much fun, but at the same time fairly sketchy due to the area that it's in. Don't leave any of your belongings unattended.
We checked out Pier 7, EMB, the orange curved bench just down from Pier 7, 3rd & Army, Union Square, China Banks and a few spots around Japantown. It was difficult to leave the UN Plaza to check out other spots, it's so much fun and the locals were really accommodating.
One of my friends works at the Canadian DLX distributor and hooked us up with a tour of the warehouse and our guide was none other than Frank Gerwer, that was a really awesome experience.
For anyone else going there for the first time, if you don't want to spend a fortune on food, hit up a trader joe's or Costco (if you have a membership) and stock up on food you can make at your spot and bring around with you on sessions. Food is fucked up expensive in SF.