Last year I had an annaul pass to Universal ( one of those buy a day, get a year deals ) and got frequent emails about the "all you can eat" pass they have. Expensive in the park - like $25 per person, but if you buy in advance online they are much cheaper. Never tried it, since we rarely went for more than 1/2 a day, but seemed like it could be worth $20 or so pretty easily.
If you want a taste of true LA food, go to Tommy's in Universal City Walk. Greasy, sloppy, great chili burgers. Been voted best greasy spoon joint in LA for many, many years. But they are greasy. Not health food by any means. They make a mean breakfast sandwich too - like an Egg McMuffin, but with chili and sausage. I do know people that don't care for the food, but it is a true LA tradition.