Best cruise idea - take a hanging shoe tree, fill it with your toiletries, jewelry, over the counter medications, etc. Pack it full in your luggage, when you get to your cabin, just hang on the bathroom door. Keeps your counter free of clutter, and I have to believe the room attendant loves not having all that stuff on the counter too!
Always visit the onboard spa early on the day you arrive. Let them give you the tour and explain their services. Drop your cabin number into every drawing you can. Take the tours of the bridge and kitchen if they are offered.