Tende is part of the Mercantour National Park and the surrounding countryside is perfect for rugged hikes, long mountain bike rides, rock climbing, via ferrata, canyoning and paragliding. It's also one of the best sites in the world for potholing (or “spelunking”, as it is also known), with the nearby Piaggia Bella being one of the deepest potholes in the world at -850m.
The GR52 “Grande Randonée” hiking trail passes by Tende on the way to Saorge, as well as many other routes of varying lengths. All trails in this region are marked on the map IGN (1/25,000) #3841 OT "Vallée de la Roya".
In winter you can ski at Réserve Blanche, a ski resort with over 100km of pistes straddling the French and Italian borders, just 20 minutes drive from Tende. There are also cross-country ski trails amongst the forests of Casterino, also about 20 minutes from Tende.