Looking at maybe planning a trip into Deadman's Cay on Long Island. If we fly into Nassau is the only way to Long Island by air or is there water taxis?
There is a boat that goes to Long Island. Below is the text from the link below the text.
Service to: Clarence Town, South Long Island. Departs Nassau Tuesdays at 12:00pm; returns Thursdays at 8:00am. Sailing Time: 18 hours; Fare: $60.00 one way; Frequency: weekly.
There is the weekly mail boat, but this is not luxury travel at all. In fact, it is mostly a freight service and very rustic. I don't recommend this at all. It is a long journey -- 18+ hours with little more than a few seats to sit on in a small enclosed cabin.
Fly. It's only 45 minutes from Nassau and a whole lot easier.