The San Francisco Bay Area is one of the premiere destinations for food and wine aficionados in the country, and home to a dizzying variety of restaurants, farmers markets, and, of course, the Napa and Sonoma Valley wine countries. A visitor could spend months -- maybe years -- exploring everything the Bay Area has to offer. Don't have that much time? No problem. In San Francisco, there are so many choices within walking distances that energetic travelers with a comfortable pair of shoes and a big appetite can have their fill.