Hey there Danielle, thought I'd put my 2 cents in here since I have a little experience on the subject. I've been on 7 cruises, all with other friends and the only time I've ever seen liquor taken by port authorities is when people try to carry it on themselves. If you pack it carefully in your luggage and then check it with the porters it WILL safely make it to your cabin door. I personally know of a friend that took (2) 24 packs of beer AND a 1.75L of Crown Royal on the last cruise we went on back in Sept of last year. As long as you put the "booz" in your luggage and check it with the porters- you will not have any problems, works every time!
Good Luck, have fun cruising!