The romance of the ship has been with me for a long time -- my fantasy has long been captured by the ocean liners that ruled the waves a century or so ago. The cruise ships of today are their direct heirs, and I've sampled several, but that's not the same thing -- even if my sailings still pleased me to no end.
Do you like all things ship-related? My experiences are that of a passenger, but perhaps there are those who have sailed on a yacht -- or even navy or merchant marine sailors.
Turning this into a semi-Book Club thread now -- I think that passenger liners of yesteryear are a fine setting for Con stories -- there often was some hanky-panky going on, if one wasn't prone to sea sickness in the times before Dramamine. Modern love boats can be steered through porny seas too!
Certain other kinds of ships -- pirate, convict... or just a mad ship swept in a revolution, etc. -- can be great for Non-Con. There's the dark side of modern cruising too, lending itself to ravishment stories.