The stretch of coast from Portofino to Saint-Tropez looks, on a map, like one continuous ribbon of blue. In practice it is a dozen very different worlds, each with its own rhythm, its own harbour etiquette, and its own idea of a perfect afternoon. Planning a journey that moves between them, part villa, part yacht, is less about booking and more about sequencing. Done well, it feels effortless. Done from a spreadsheet, it rarely does. Here is how a journey like this comes toge