Review for Rio Hotel & Casino Review For Carnival World Buffet Google User May 24 '18 at 2:50 No "seafood" buffet at Rio any longer. As of about 2 weeks ago/middle of May '18, they have one buffet, Carnival World Buffet. I felt it was a little Asian heavy but had items like: roast beef and chicken, veggies, small salad bar, potato salad, a few soups, pasta and pizza, feel and eat shrimp, a couple of fish options, oysters, crawfish, and many desserts. Paid $29.99 for weeknight dinner and $13 for unlimited select wine/beer. Good selection, just not what it used to be. View full site to comment or like