The old railway line along the Dordogne Valley between  Sarlat and Souillac is now a walking and cycling track. Gentle gradients, shaded and with a terrific tunnel to whoop and echo through. Hire a bike at the Sarlat end, or from the Saint Julien bridge, and enjoy a couple of hours of easy cycling, or pack a picnic and stop for a swim at the Saint Julien ‘beach’.