Take an over the door hanger - works great when the closet fills up or to hang items that need wrinkle release.
Take Wrinkle Release - spray the morning of and by dinner wrinkles will be gone - that is packed wrinkles.
take a flashlight in case the electricity goes out.
take a 3 way adapter and the 1 electrical outlet will become 3
take some orange or yellow duct tape and mark your luggage easy to find, plus no one wants to take luggage that looks like its broken!!
take a small cooler to keep your drinks cool