I don't know about Carnival, but other cruise lines are starting to offer real Hold'em. Usually just 1-4 tables, and always LHE. I have heard of limits from 2/4 up to 4/8 or 5/10 (can't remember which). Nothing higher, and no NLHE so far (just from what I've read, not necessarily what is true).
I have heard of high rakes, 10% up to $5.00 or more, but that is still cheaper than some out-of-country cardrooms as well as other casino games on cruises.
Good luck!
Felicia [img]/images/graemlins/smile.gif[/img]
www.felicialee.net