The Parco Nazionale del Golfo di Orosei e del Gennargentu is Sardinia’s largest national park, taking in the Supramonte plateau and the Golfo di Orosei. Here the high mountains of the Gennargentu abruptly meet the sea, forming a crescent of dramatic cliffs riven by false inlets, scattered with horseshoe-shaped bays and lapped by exquisitely aquamarine waters. Beach space is at a premium in summer, but there’s room for everyone, especially in the rugged, elemental hinterland.