What is the best place for tacos in San Francisco?

This answer depends on whether you want to optimize for ambiance or the quality of the food. If the latter, the Mission District of San Francisco has countless taquerias and taco trucks with tasty and authentic street tacos. If you are looking for a night out with friends or a date night, I would suggest going to a Mexican restaurant - and my favorite is Tacko in the Marina neighborhood of San Francisco. Tacko has amazing guacamole and cheap pitchers of margaritas.