I have not been to Rum Point -- so I would like to hear more too since I am considering it.
Anyway, I do know one way to get there, but I don't know if this is the best way. The Hyatt runs a ferry to Rum Point. In fact, it is my understanding that they manage Rum Point as well. I would be interested if anyone else knows about this. And if there is a better way to get there -- perhaps it's better to go directly by car or taxi from the dock instead of getting a taxi to the Hyatt and then the ferry from there?