In the village of La Grave, take the Téléphérique des Glaciers cable car and go up to the Peyrou d’Amont station at 2,414 metres.
(S/E) Upon exiting the cable car, take the east-facing path which begins with a descent. After passing under the cable car cables, ignore the first path on the right and continue straight ahead. A little further on, do the same: ignore the path on the right (normally reserved for mountain bikes) and continue on to Lac de Puy Vachier.
(1) Walk round the lake on the right-hand side, ignore the path on the right once again and start the climb towards the Évariste Chancel refuge, which can be seen on its promontory.
(2) After perhaps having a snack at the refuge, return to the main path and take it to the right.
At the next junction a few metres further on, continue to the right and follow this path to the viewing platform.
Admire the view over the Romanche Valley and the Grandes-Rousses mountains as far as the Galibier, then turn back.
Return to the cable car station (S/E) via the same route and head back down to La Grave.