Actually the ferry crossing might be one of the highlights of the trip. Only made one ship crossing & that was a freighter no bigger than one of the ferrys from NY to Bermuda. A 3 day crossing on a near flat calm sea.
Never done a cruiseship but have done a month aboard a 65' motoryacht from Ft Lauderdale to the Exumas.
We will be crossing late May so chances of rough weather should be slim. Are vehicles secured to the deck or does that depend on weather & type of vehicle?