A cruise is my idea of a nightmare. I avoid boat journeys wherever possible - I have been known to take lengthy and rather circuitous plane rides to avoid having to go on a ferry. You know what they say about sea-sickness: "At first you feel you are going to die, but then it gets worse - you realise that you will not!"
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .