I'm visiting for a few days, staying ner the Convention Center/Gaslamp area; desperate for good Mexican (not Tex-Mex!) food - can be in a restaurant, shack or taco truck. I know there are past posts on good places but don't know the local geography. So please help: Are there good places I can get to 1) by the streetcar? 2) by car w/in say a 20-min drive? Please exclude lunch-only places sicne I only have roaming time in the evenings. Thanks!