Let's see...there are several...
Hands down favorite/to die for: Somis Cafe, Somis, CA - asada soft tacos, enchiladas, chimichangas, sopes...
Burrito Loco, 4th Street, Oxnard, CA - awesome asada burritos - very simple -meat, beans, rice, cheese, sour cream, salsa...
Sal's Mexican Inn, Oxnard, CA - everything on the menu is great and their Margaritas as really good.
Cabo Seafood Grill & Cantina, Oxnard, CA - really great shrimp and the salsa is good too
Las Cazuelas, San Mateo, CA - great burritos, even better asada soft tacos, the salsa is addictive, beans/rice is addictive too
El Paseo, Santa Barbara, CA - kickin' Margaritas, great menu, large selection of Tequila, atmosphere transports you south of the border...rang in my 30th Birthday here and couldn't have asked for a better celebration!!!