Now that I am back, I have a little more insight.
A few musts...visit the Venetian at a good time for dessert. They have a gelato stand that is the best I've seen since visiting in Italy. It's near the center where you buy tickets and board the gondola.
We wanted to go to craftsteak, Tom Collichio's place (Top Chef's judge), but we got there too late. A lot of the high end restaurants only serve dinner.
We grabbed "brunch" (they have both breakfast and more savory lunch options at Le Bouchon in the Venetian, but it isn't on restaurant row or in the plaza. It is to the right of the main lobby on the 12th floor I think, near the pool. It was like we were eating in France. A great find.
Overall, each newer casino has a few top restaurants. Didn't see too much to write home about in Harrah's, the Flamingo, Imperial, etc.