I come to SF frequently for work, always arriving on a Sunday and staying in the Financial District. It's a ghost town. Plenty of places to eat during the week, but most restaurants have no Sunday hours, and the ones that do (Kokkari) are only for dinner and I've eaten at them frequently enough to be bored and want to see what else is out there.
So, where should i have lunch in that area? I'm not married to staying in the district proper, and get around on muni/bart just fine, but after a flight in i'm usually beat enough that i don't wanna spend an hour on a bus or light rail, so that maybe means chinatown or north beach?