I second White Water Snacks... its easy to get to from the California Adventure gate.We had cheeseburgers there once on Thanksgiving day!
Love the nachos too!
DL: Plaza Inn chicken, plenty to share, with an extra mashed potato, and side salad.
California Adventure:
Flo's V8 Cafe, or another vote for the sour dough bowls, with soup or salad.
--Lori