What is a recommended itinerary for visiting Monte Argentario in one day?

For a day focused on nature and swimming, start with the reserve of Feniglia, then go through Porto Ercole et termine à Porto Santo Stefano taking the panoramic road, if you have a car. In the morning, walk or pedal under the pines of Feniglia — the path is about 6 km — and choose a spot on the beach for a swim. In summer, arrive early: the car parks near the entrances can fill up quickly.

Déjeune à Porto Ercole, then keep about an hour for its old port and its narrow streets. In the afternoon, take the Strada Panoramica towards Porto Santo Stefano: allow around 25 km between the two towns, but more with photo stops; the road is winding, so don't plan to cover it at a running pace. Finish with a stroll along the seafront of Porto Santo Stefano. If you prefer a cove to the villages, replace Feniglia with Cala del Gesso, but be aware that access is on foot via a steep path: this is not a beach where you simply get out of the car. In one day, it is better to choose just one real swim rather than going from cove to cove.