These are the top ten most common visitor blunders, in my experience.
I spent six years working on cruise ships and saw the same errors made by passengers again and over.
Because they weren't acquainted with the ship, many passengers missed out on the fun events that took place every day.
The loss of a port or a sudden change in the schedule might spoil a vacation for some passengers.
In most cases, the day you board is the same day that the prior passengers disembark.
So keep in mind that the crew will have to quickly turn the ship around in order to accommodate you.