One long-distance hiker's rest day has turned into one of the better travel itineraries you could copy in southern France: a full-day kayak drift down the Gorges du Tarn, one of the country's most dramatic river canyons.

The writer, mid-way through the Hexatrek long trail, handed over their gear to a kayak rental company at Castelbouc, got a life jacket and a cheerful "voila" (the safety briefing got lost somewhere between two languages), and set off downriver at 8am for a 24-kilometre paddle. Rental shops estimate around eight hours including stops, though the gentle current does most of the work.

The gorge itself is a UNESCO World Heritage site, and it earns the label. Towering limestone walls give way to morning shade, class 1-2 rapids pop up regularly enough to keep things interesting, and the scenery stacks up fast: a handsome stone bridge beside a village perched right on the cliff edge, then a sprawling medieval castle with roughly thirty rooms watching over the water.

Timing matters here. The first two hours on the water were near-silent, with the river almost to yourself. By 11am the holiday crowds arrived — first-timers spinning in circles, capsizing cheerfully, and whooping through the narrows in big groups. Early birds get the calm river; late risers get the party. Either way, the water stays cool and swimmable, and there are plenty of put-in and pick-up points along the way if you'd rather do a shorter stretch than the full 24km.

One quirk worth knowing: because the gorge is a protected World Heritage area, wild camping (bivouacking) is off-limits — you can only stay at commercial campgrounds until you climb out of the zone. Our paddler had to gain 810 metres of elevation to reach legal bivouac ground, which is a fair ask after eight hours on the water. The flip side: the trails out of the gorge are lined with blackberry bushes in season, and the views back over the canyon walls are worth every metre.

The day cost the hiker about €30, a reminder that some of France's best experiences are also among its cheapest. For anyone walking sections of the Hexatrek, planning a Dordogne-and-Cevennes road trip, or just wanting a low-effort adventure day, a self-guided Gorges du Tarn paddle is an easy win: no experience needed for the gentle rapids, gear and shuttles handled by the rental outfits, and villages like Sainte-Enimie and Castelbouc to explore between strokes.

Go early, pack lunch and plenty of water — summer heat in the gorge is fierce — and leave time in the afternoon for the climb or a campground booking before you run out of legal places to sleep.