There are a couple of things I would like to tell you just to prevent you get disappointed on board.
Check the location of your cabin.: Cruise ships have a lot of fire screen doors to prevent smoke travelling through the corridors in case of fire. Some are always open and can be closed automatically. But some are always closed and need to be opened when you pass through. A lot of these doors are slamming. Make sure your cabin is in the middle of the corridor and check the location.
Check the cruise schedule also known as the Itinerary:It always looks fantastic when a ship sails into a lot of different ports in a short period of time. But you don't need to be a rocket scientist to figure things out.
Just by looking at the chart either you need a hell of a speed or you will be visiting the port very shortly. Most of the time it is the latter. Cruise companies try to save a lot of money just by reducing speed as much as possible so be aware and ask your cruise consultant for more details.
Learn a little bit more about the maritime world: Try to imagine how life was in the old days.
How the safety improved in all those years. Think about the Titanic for example. Well I can assure you this; a lot of things have changed since 1912.