If it's a nice Saturday, take advantage of the weather and head over to the ferry building farmer's market.
Wander around, eat some samples, and then find Primavera. Get the chilaquiles, slather some salsa on it, and find a place to sit. Try one of their drinks to help you wash down your food.
Primavera's stand is there Saturday's from 8am to 2pm. Bring cash!