Twice a week the boat runs to one of the inhabited islands in the atoll for a couple of hours. A school, a harbour, a boatyard where they still build the old way, and shops that sell nothing a resort shop sells.
Please cover your shoulders and knees on an inhabited island. Nobody will be rude about it and it matters to the people who live there.
The guide is from the island rather than from here, which is the only reason the trip is worth doing.