I'm going to be in San Francisco for the first time (as an adult) next week. I've basically only got a day and a half before business-related matters will overtake my time. My hotel is in the Japantown area. Does anyone have any recommendations for two lunches and a dinner? Japanese/sushi is the obvious choice for at least one, but I imagine there are hundreds in the neighborhood to choose from. Any particular favorites? As I'm a total newcomer, I'd thought it would be nice to walk to my meals to get the feel of the city.