Make a list of things you MUST have, such as a warm climate, separate cabin for the kids or Christmas in a certain region.
Go online to read more about the specifics you want such as non-Christmas events or spectacular Christmas sites around the world.
Consider how much time you have to invest in a cruise since kids may need to be back to school by a certain date.
Compare prices with several different cruise lines. If you're not using an agent you can still save money by doing your own cost comparisons and booking online.
Book the cruise well in advance of your trip to get the best deal.
