I just returned from a long weekend in San Fran the last week of January. I would recommend Fior D'Italia if you like Italian Food. It's walking distance from the full service Marriott (Fisherman's Wharf). They claim to be the oldest Italian restaurant in the U.S. The decor is beautiful and the food was excellent. Some what pricy, but worth. Here's the website: http://www.fior.com/<</a>/p>
If you haven't been to San Fran before, I would highly recommend visiting Muir Woods to see the Redwood trees. They are awesome. Also, Alcatraz was quite an experience. My wife and I did the night trip, but the shorter day trip would probably have been better. There was construction as the Marriott Fisherman's Wharf on our floor when we visited. No big deal as the rooms were being refurbished. Hope you have a good time.