La Palapa [77 St. Mark's Place, New York; Menu]
After walking past this place countless times, I finally went in to eat here. It turns out that the food is pretty good, although not spectacular. Make sure to start off with some Guacamole which is excellent, but you might need two portions because each one is not that big. I tried both tacos and quesadillas. I preferred the quesadillas and would recommend the Bistec, which was noticeably better than my other dishes. It is also worth noting that the margaritas are very tasty and the food is generally spicier than most Mexican places I have been to.