First Visit to San Francisco and Napa

Hi Everyone,

I'm visiting San Francisco in March to take the Level I Exam, and I'm also hoping to head to Napa for a day. Does anyone have any suggestions for must-visit restaurants in San Francisco?

As far as Napa goes, I'm hoping to check out several different wineries. Any recommendations? And any unique educational experiences for someone just getting into the world of wine? Suggestions would be greatly appreciated.