As of last year, Carnival does not have a players card. However, they do have a "tournament". Entry is $20 and you can enter many times. You play 7 hands, and the 8 with the highest chip count will play in the final together. Again the final is 7 hands and the winner gets a cool shirt (Hey, I like mine!) and $500 (which my wife enjoyed).
Apr 1994 Fantasy Bahamas
Dec 2006 Glory Eastern Caribbean
Aug 2007 Glory Eastern Caribbean
Jan 2009 Fantasy Western Carribean
Aug 2011 Inspiration Western Caribbean
Aug 2012 Dream Eastern Caribbean