The one trail in the park built for wildlife, not summits.
Val Trupchun runs south from the park's eastern entrance near S-charl, following a wide, gentle valley floor rather than climbing to a pass or peak. That flat profile is exactly why it works so well for wildlife: the trail stays low, the valley is broad enough to see animals well before you're close to them, and the grade is easy enough that you can walk slowly and actually look around instead of watching your footing.
Route and distance
The walk from the trailhead to the head of the valley and back runs roughly 14 km round trip with modest elevation gain — comfortably a half-day outing for most walkers, longer if you stop often to watch wildlife, which most people do. The path is well-graded and suitable for families with older children.
What you'll actually see
Chamois are visible along the forest edges for most of the route. Ibex favour the steeper rock bands higher up the valley sides, more reliably spotted with binoculars than at close range. From late August through October, the valley floor is the park's best red deer rutting ground — expect to hear stags roaring across the valley well before you see them, and to see harems grazing in the open meadow sections.
Why this trail specifically
Trupchun gets recommended above the park's other routes for one practical reason: its width. A narrow gorge trail like the route to Chamanna Cluozza concentrates foot traffic into a single line and pushes wildlife back from the path; Trupchun's open valley floor means animals have room to keep their distance from walkers while staying easily visible. It's also the flattest of the park's three trails, making it the only one that comfortably suits a family day out.