We always notify the casino host a week or so before sailing. In the past they have decorated our cabin with the Bon Voyage stuff and also have left gift baskets of fruits, nuts, cheese etc. The casino manager has bought us drinks, and we have received a tote bag with OPC shirts, hats, playing cards (carnival logo type items). I think last time we got a $100 casino credit. It's not the same kind of perks as land based casinos, but it makes it fun. My husband enjoys wearing his OPC shirt even if we are at a casino in Nevada.
The casino host on one of our recent cruises, sent us an email after the cruise which was nice. We are not big-time gamblers. It's just part of our entertainment.
If you are going to be in the casino, it doesn't hurt to let them know.
Ecstasy 12/12/09,Conquest 4/12/09, Conquest 4/19/09,Conquest 2/09, Pride 10/08, Ecstasy 1/08, Miracle 3/08, Miracle 4/08, Miracle 5/06, Conquest 12/08, Conquest 9/07, Conquest 4/07, Conquest 8/03, Destiny 5/05, Adv of Seas 5/05, Elation 12/04, Jubilee 4/03, Sensation 6/00, Celebration 5/93, Celebration 6/92,Holiday 5/92, Tropical 3/90, NCL--Windward, Skyward, Sunward