What cruiseline are you sailing on?
What kind of booze are we talking about?
I have been told people have better luck w/ smuggling in their checked bags rather than carryons. Hide it well in shoes, pant legs @ bottom of luggage. Double bag it in ziplock bags to prevent leakage. Don't get greedy --- just try a small bottle or two. More will be less likely to get through unnoticed.
And good luck. Let us know how you liked your cruise and if you are successful.