The Carnival World Buffet is definitely a place to check out. Almost every food nationality is represented. Pizza, Stir Fry, Sushi, Crab, Shrimp and more. The breakfast buffet is also good. The best bet is to get to the Rio right before Dinner starts and save a couple of dollars. We usually eat a late breakfast which consists of Eggs Benedict and wait for the Sushi to show up. You can also get Rio Coupons or line passes if you ask the staff. If you have never been to the Carnival World Buffet, put is on your list of things to do while in Las Vegas.