You've probably seen the Romana Sambuca
bottles behind the ship's bars. It is a licorice flavored liqueur.
I don't think the other lines have as good a program as Crown & Anchor, but then I guess it is how one views the perks as far as usability. Princess has good loyalty perks, and Carnival came late to the game although I like their free wash and fold laundry for people with 10 cruises.