You do not need to pack the machine, carry it on. It's considered a medical device, doesn't count against your carry on. Also, I'd mark your case. I called customer service and requested an extension cord and distilled water. It was added to the reservation.
Has anyone done The Boss Under Water Scooters? We have snorkeled before but nothing like this. We are on the Sapphire Princess in November. The cruise lines only offer this in St. Thomas. I've not had luck finding them independently in other ports.
Very helpful review. Especially helpful the shoes and back pack suggestions.
Did you have any extra time after this excursion to shop and see the port area?