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N821 is Barbados to Barbados, I believe, if this is the case then there is a flight involved but with whom I do not know. Most airlines insist that hand luggage falls into the dimensions of 56x45x25cm (22x17.5x9.85in) and there is no way that a suit bag or carrier could fall into these measurements.
Cabin 220 + should not be noisy because you are far enough away from anything, like the anchor or ropes to disturb you and cabins above you so don't worry. .... Neil.
You can carry what you like onboard the ship, but if your cruise involves a flight then you must comply with the airlines regulations to board the aircraft. I suggest you look at the airlines website if that is the case.