We were there in January--add my vote for The Slanted Door. They also have a breakfast/lunch counter that we didn't have a chance to try.
http://www.slanteddoor.com/If you're at the Ferry Landing during the farmers' market, look for the yogurt vendor out front--she sells sheeps' (or maybe goats') milk yogurt with fresh fruit that's unlike anything I've ever tasted. Try the strawberry.
Bocadillos--we ate there for breakfast and loved it.
Town Hall was stunning, even though they'd run out of fried chicken. . .
We had tapas at Zarzuela for our last dinner, and it was perfect.
Have fun!!
Bacon is meat candy.