In reply to sbc_10: We did a walk in reverse, we started in the Valleee Blanche, went down the Geant Glacier, then the Tacul Glacier, then the Mer de Glace, then the Montevers train back to Cham. Very beautiful walk, heavily crevassed in places, stone fall that you would need to watch out for, and ice fall from 1-2 glaciers above.
If you'd like to go for a scenic walk, definitely worth it, just keep your wits about you.