Highfive,
I highly recommend Alladin's Spice Market Buffet with it's Middle Eastern flair.
The Concierge at the Bellagio told us that almost any of the mid to upscale restaurants will prepare something for you even if there isn't anything on the menu - she said to just ask the server.
California rolls have cooked meat (crab), as do the freshwater eel rolls (unagi), and there's a folded-egg type "sushi" (tamago). Most places have some sort of veggie rolls - throw in miso soup, edamame (soybeans), gomaae (spinach w/sesame, my fav), etc, and there should be enough to keep a non-meat eater occupied.
Fish has been reclassified as a vegetable? Go figure....what'll those crazy cats at the American Heart Association come up with next....