Haven't been on a cruise, but just back from Ireland and one item I greatly encourage you to take is a sketch book--I not only used it to jot down notes from what I saw, but also sketch different designs I saw or was inspired by that could become quilting designs or inspirations for quilt tops--even if it's just listing of colors that you see in a scene. Guess what I'm saying is that while you might not get lots of piecing done (and I wouldn't bring a machine just cause of lugging one around and not wanting to be sitting in room by myself) a trip can provide you with so much inspiration in all the new "views"!