On Sunliner, a 36-metre Siar Moschini, a crew of six looks after just eight guests in four cabins. Two stand-up jet skis and a wakeboard cover the livelier hours, two paddleboards and snorkelling gear the quieter ones. Beaulieu-sur-Mer, her base, sits at the neck of Cap Ferrat; Villefranche is on the far side of the cape.