Or just leave the closet ajar for a nightlight
with all the crap that people like to drag along on their cruise, the one thing I actually endorse bringing is a nightlight! small, light weight, and needed for those who get up in middle of night.
as far as what I would have liked to know: reading as much as you can is important. making a list of must-do's is important. reading the navigators is imperative! learning to ignore all your list and plans and going with the flow is the absolute!!!! unless you want to run around the ship like a maniac for the length of your cruise, you will find it easier to make up your mental itinerary each morning or evening with the navigator.....there will be other cruises to see what you missed. oh, and don't sweat the dining rotation....its all good
That is why God invented on-board booking discounts!
enjoy your cruise! life is short....make the most of it