Mauritius
The showpiece is aft. Her beach club drops a huge submersible hydraulic platform to the waterline, turning the stern into a private sea-level lounge — and then the toys come out. Stand-up paddleboards, inflatable floats, and an optional iAqua underwater scooter for guests who'd rather explore reefs from below than above. Up top, a vast flybridge keeps the sunbathers and the view-seekers equally happy.