Some people will have their Set sail pass, their receipts for every excursion they purchased on the cruise planner, the recipe for their drink package. printed maps of the ports of call. On top of that, possibly their flight itineraries, a list of dining times for their UDP, a spread sheet of events they want to go to onboard.
There truly is no end to the amount of extraneous things people will print out prior to a trip. I trust my tech. I has never failed me.