Just remember when you pick up your blasting again, you won't be lifting AS heavy as when you were pre-cruise. The mentality will be tough getting back into the intensity when you're a little "weaker". Just keep that in mind for your first run through! Noone under the sun will come off of a cruise as strong as when they came in.
My advice is to slightly undershoot some exercises so you won't get destroyed your first week back!.. Just don't be a pussy.