I go through all of my documents. I take one of those inexpensive folders with the three fasteners and 2 pockets. I fill it with a bunch of clear page protectors.In the front I print mapquest directions to the port. A copy of all our passports, setsail pass, birth certificates.
A printout of any excursions I've pre booked.
Important phone numbers, including my credit card carriers, in case I lose my cell phone. It's light weight, doesn't take up much room and keeps me from dropping things in line at check in.
I also like to print out the deck plans floor by floor so I can know where I'm going.