Unfortunately my favorite spots are down in San Diego, but I know for a fact that there are several Rubios and Wahoos up in the Oceanside/Carlsbad & San Marcos area and they are pretty good. Sounds like you guys have a lot of fun planned, I hope you enjoy yourselves!
Now see, there you go starting a dilema with me. I hated So Cal, but loved San Diego, and it's actually much more conservative than LA.
Then you get into the places worth going around Point Loma and the Subase...
Casa de Loma
Santana's-Send the nub out on a run for the duty section. Carne asada burritos. Oh. My. GOD.
Adelberto's, Aiberto's, any-freakin-berto's. 100's of them, all good if you don't ask too many questions. Few things better than rolled tacos with cheese and guac at 3 am.
Miguel's. Best cerviche EVAR!
You get the idea.