To add to Dave's post, most people who come onboard to give a lecture ask that you not videotape them. Their lectures are copyrighted. I attended one once where the lecturer had to ask one person three
times to stop videotaping
When muster drill is announced, show up. On some ship's no one is able to leave until everyone's accounted for. Be there and be on time!
In tender ports, if you don't have
to be off the ship for a scheduled excursion (ship's or private) wait an hour or so to try to get off. Have a leisurely breakfast and you won't be standing in the hallway or on the stairs for 30 minutes.