This challenging but exhilarating day hike (about seven hours round trip) begins at the car park near the west end of the Pineta valley and ascends 1300m (getting steadily steeper as you go) to the Balcón. This barren, vaguely plateau-like area far above the treeline provides fantastic panoramas back along the valley and also close-up views of the glacier-laden north side of Monte Perdido.
It takes about four hours to climb to the Balcón and three hours to return. Follow 'Camino Marboré' signs from the car park, and after the signs give out, the way ahead is fairly obvious and marked by cairns. A short detour on the way up or down takes you to a set of impressive waterfalls, the Cascadas del Cinca. From the Balcón it's well worth continuing another half-hour to Ibón de Marboré lake at 2600m, beneath the rocky ridge that forms the French border.