Tostadas you can't ever go wrong with, chimichanga is good, and enchilladas are good. I usually look for those three first before anything else. If not most places serve your typical tacos/burritos or casadia's. If spicy is an option and you enjoy some heat always go spicy. If they do it right they will incorporate pepper seeds or a small amount of the pepper itself in a homemade sauce instead of using a premade hot sauce which you will notice instantly. If the heat isn't blended into the flavor of the dish they are using a hot sauce. I know a few Mexican restaurant's that tried to make something spicy by adding Franks red hot, not the same effect