Here's my take...
The photographer, and not the camera, is what makes a great photo.
Yes...the big cameras do take nice photos...if it's photos of the ship itself, or
Castaway Cay...or pretty much anywhere you're going to visit, you can find better photos "on-line" than you can take yourself.
I prefer a good quality camera which can slip into my pocket...just for the convenience sake.
As a side note...I've found I enjoy a trip much much more when I'm not trying to document
everything that happens...and just enjoy the moment. I've see so many folks who are so caught up into trying to photograph or record every minute of their vacation, that they can't relax and enjoy themselves. Facebook has really magnified this "problem".
I've got some of those tapes myself...I remember thinking it would be a neat idea to turn on my video recorder and hold it by my side while walking from the castle down main street of WDW. Without a doubt, the most boring video you will ever watch!
Within a generation or two, nobody will know who you are...and your offspring will not know who the folks in the photos are...so the photos will end up in a "virtual" closet....collecting virtual dust.
Enjoy life as it happens...
ok...my sermon for the day is now over...so whatever camera you choose to take...
HAVE A GREAT CRUISE!!!