Siorac is in the heart of some of the most beautiful walking country in Europe. Tiny untrafficked roads and clearly marked offroad paths are everywhere. Siorac appears on the IGN map 1936ET and the walking paths are clearly marked. From Siorac we crossed the river and climbed up away from it to a broad expanse of Edenic countryside, rolling pastures, woods, farmland and fabulous views, arriving eventually in St Cyprien, a medieval town on the north bank of the Dordogne, which we had admired earlier from the train window. St Cyprien is loomed over by its massive old church, the home parish of one the Avignon Popes. Wandering down from the church you encounter a warren of quiet ancient streets before you're spilled back into the 21st century. following the path through the fields along the rivier for a mile or so, you come to a bridge which will lead you to Allas-les-Mines. from there you have many choices of path back to Siorac, all involving a stiff climb back up away from the river.
Why was this special? Probably because we were the only ones doing it. The whole world seemed to be in Sarlat and Les Eyzies and Beynac, but after a long hard year in the city I don't want to see the whole world, and after a few days in this beautiful silent country I could feel the stress rolling away.
French provincial public transport is a highly idiomatic adventure. Little timetable folders are available in all the stations and you must read them very carefully because they're seething with small print. You can easily have your trip deviated by missing a detail, and the smaller the town the scantier the service. Take special care if your itinerary involves getting from a tiny place to a bigger one, because you might find that the convenient departure from point A neatly arranges to have you miss the only departure from point B. We needed to compose a flow chart to get from Siorac back to Paris.
Sometimes buses can fill in the gaps, but they're more intended for local working people so the schedules can be very odd.