I would urge you to take a laptop with you in that instance, as the cost to download would be 0. Donnar made a great point. It is very difficult to remember each shot after you get home but if you download every night and name the shots, it is much easier.
I use my notebook for:
Pictures: I download every day
Music: I bring speakers for my Itunes and play "Shuffle" the entire cruise.
Work: I can get more accomplished on a cruise than anywhere else.
Entertainment: I bring movies, just in case of inclement weather.
Communication: on most cruises, Wi-fi is available. I use SKYPE (http://www.SKYPE.com
) to stay in touch.
I could go on, but now I am embarrassed.
(no life) Tom