I'm puzzled by the glowing posts about San Rafael's Taqueria San Jose. It is depressingly dingy, frighteningly dirty, and although my husband liked his burrito, my soft taco was filled with tough, greasy, gristly pork carnitas (and I had ordered al pastor). My quesadilla was tasty, but the chicken on it was really too "soupy wet" and made the corn tortilla soggy.
We are fans of the El Sombrero Taqueria in Healdsburg, and would drive the 40 minutes it takes us to get there. It is spotless, cheerfully decorated, and the food over-all is delicious and not at all greasy or heavy. The soft tacos are especially good. Of course some of the taquerias in the Mission are exemplary, but alas, too far to drive just for a fix.
Also, the La Luna Taqueria in Rutherford is yummy. Their vegetarian burrito is the best of any in Napa County.