At Mont Dore take the Route de Sancy and park in the car park in front of the Gîte de l'Ecir(S).
Take the right-side opposite and reach the Vallon de Courre.
When you get to the ski lift (1) take the trail that crosses this small valley before climbing sharply up to the col (2) by the the Tour Carrée (square tower) where it joins the GR30.
Turn left on this GR and quickly reach the summit of the Puy de Sancy on the path along the ridge (3).
Follow the GR to reach the Col de la Cabane to change GR. It is currently the GR4 that leads to the summit of the Puy de Cacadogne (4) and then the Roc de Cluzeau (5).
Then descend in the plain, by the stream (intermittent), leave the GR and turn left onto a tail along the left bank that leads to the Grande Cascade (6).
Continue the descent, reach Mont-Dore again and return to the car park (7) via the road on the left.