Agree about no. 4, I always pack too much, but I will never pack towels (no. 7) as I always have to fly to my cruises.
About no. 5; if you are from Europe and bring an alarm clock that is connected to the power outlet (230 V) you have to consider that the frequencey is 60Hz onboard, not 50Hz as we are used to in Europe. This means that the clock will go 20% faster than it should (I've tried that on Voyager OTS and was very confused at first...