Chuck Roslof: The marketplace has lots of great shops and restaurants in it, and is a nice place to walk around (plus, views of the Bay). And there's a good farmers market on Tuesdays, Thursdays, and Saturdays.
Chuck Roslof: Excellent Greek sandwiches. The salads, potatoes, and frozen yogurt are great, too. There are additional locations on Divisadero and in the Mission.
Chuck Roslof: Possibly the best sandwiches in the city. Definitely a weekday lunch place in terms of hours. No seating, but you can take your sandwiches to Yerba Buena Gardens nearby.
Chuck Roslof: I like their ice cream a lot, but the real draw is the old fashioned-style soda fountain. Their food is also good, and they have an outpost in the Castro as well.