Maya [1191 First Avenue, New York; Menu]
You may not have realized it, but there is such a thing as upscale Mexican food. And Maya serves it up with aplomb. The guacamole is a must-have appetizer and the Tacos de Punta de Filete (basically Filet Mignon tacos) are very good as well. For main dishes, I would recommend the fish, either the Pescado a la Talla (Red Snapper) or Robala con Hongos (Striped Bass). Make sure to wash your food down with a margarita (I like mango the best) and be prepared to pay for the quality meal you get here.