Sedici is the fun one — a 2022 Riva 66 Ribelle, a hardtop sports cruiser with twin 1,550HP engines and a 37-knot top end, the waterborne equivalent of a Bentley. She's built for the day: foredeck and upper-deck sun beds, a cockpit wet bar with a BBQ, a hydraulic swim platform, and Zero Speed stabilizers for comfort at anchor. Six guests in three cabins with a Neapolitan captain and stewardess — the pick for a couple or two who want a stylish, quick boat to bounce around Sicily and the Gulf of Naples rather than a big static motor yacht.