This wide path leads up into the forest, crossing the Crosette torrent via a footbridge, shortly before arriving at the Chalet. From there, continue on past the chalet for another 10 minutes to the view point over the glacier.
If you sit quietly here you can actually hear the ice creaking and moving and if you're very lucky, you may even witness one of the ice walls (seracs) falling.
You can return by same route or descend down to Les Songenas via the path signposted from the chalet. It is also possible to start this route from the Centre Ville car park, under the Aiguille du Midi (add 45 minutes each way).