"Any boats" is definitely more possible than "ferries." You're looking for private boats which can carry a motorbike and happen to be headed for DR or Jamaica? Or for boats which follow some sort of standardized routes "around the islands?"
The Caribbean is not like the Baltic, Aegean or South China sea, with lots of ferries zipping here and there.The only boat I've heard of which follows any sort of schedule around the Caribbean (rather than between Panama and Colombia) is the Stahlratte. Google it. It offers the possibility of getting from Colombia to Cuba, and has once or twice stopped off in Jamaica. When you look at the schedule you'll see that it won't really work for what you want to do.
If you do find a private boat willing to take your bike on board, think carefully about the effects of blowing salt water on your bike during the time it's exposed on deck. And if you manage sea or air freight, post back here about it so others can benefit.
Mark
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