I took 2 on my recent cruise, 1 x Canon Powershot A2000IS compact and a Canon DSLR.
The DSLR only came out once from my luggage as it is quite bulky even for a DSLR and my compact Canon was quite capable of taking high res photo's and video's as well.
As this camera was also cheaper to replace I found that it is a better option as some how particles of "something" have lodged themselves in the rear screen of the camera and may ultimately cause failure.
Go for a good quality compact digital camera and leave any big camera's at home.
Also take lots of 1 to 2 Gig memory cards if you don't take your laptop with you.