I will be coming to San Diego from Seattle in April and I'm hoping someone here can recommend a really great Mexican restaurant to me. I am meeting a friend from Australia who hasn't had Mexican before and I want to show her what the good stuff tastes like. No Las Margaritas or Aztecas, please - I'm looking for the real deal. The other requirement is that it should be a sit down that is nice. While I am not adverse to taco trucks or dives myself, I would like to take my guest somewhere where there's an enjoyable atmosphere for her and her 13-year old daughter.