If you do try to bring your boat I bet wearing a suit, shaving, combing your hair would help. Members of the establishment get away with a lot more. Whatever you're doing, act as if you're perfectly right in doing it. "I'm going down there for business and I'm bringing my surf-ski."
I think they're right on the boat rental, though. Travelling around down there and in the caribbean I've lost more luggage...you might end up renting one anyway and wondering where the hell your boat is.
I hope in the future Americans are thought of as a warlike, vicious people, because I bet a lot of high schools would pick "Americans" as their mascot. -Jack Handy