I suggest making reservations at Tchoup Chop. As gschmerl mentioned, use opentable.com if you want to dine at Tchoup Chop.
I also agree with gschmerl with the breakfast buffet at the Islands Dining Room. However, as the price is expensive, I'll eat here only once per trip for breakfast.
I also like to grab a bite at Jake's American Bar when I can. Food, drink and scenery is good at Jake's.