From the Le Buet train station and car park, head west and cross the main road and look for signs for Cascade de Berard. There are three main trails that head towards the little hamlet of La Poya and it will not matter much which one you take. At La Poya you will see the trail marker for Cascade de Berard. You cannot miss it. As you approach the waterfall you can stay to the right side to go to the metal platform they have built there to come real close to the waterfall. After doing that, you can take the steep staircase to end up right in front of the Buvette de Berard, a little snack bar beautifully perched above the waterfall. From the Buvette make your way east and follow the signs for Refuge de la Pierre a Berard. This will be your next major destination. Its a single trail that keeps going west and it is well marked. You cannot go wrong here. The refuge sits at the far end of the valley and has nice views and its a great source of water and food and snacks when it's open. From Refuge de Berard you will head out in north western direction past the water fountain and start your climb up to the Col de Salenton. There are a few routes you can take here to make your way up through this rocky section of the trail but they all end up on the same ridge near the Col de Salenton. At this junction you can take a right turn to head towards the summit of Le Buet but you will be taking the left turn and head towards the Col de Salenton. The Col itself has a nice view of the valley ahead and back towards the valley you just came from. From the Col de Salenton you will start descending westwards. Initially the main trail is very clear and you cannot miss it. The two times I visited it, I got a bit confused by the side trails and cattle trails and I ended up getting off the main trail. If you have a GPS app then now would be a good time to use it with the general goal of staying on the main trail and crossing the little streams and getting towards the valley floor and the main route towards your next main destination: the Chalets de Villy. There is a trail that reaches the Refuge de Moede Anterne from a more westward and higher altitude approach but the main trail, that is part of the GRP Tour du Pays du Mont-Blanc, is the trail I suggest you take and that one passes by the Chalet de Villy. You will be able to see the Chalets fairly early on from a distance as you make your way down the valley. The two times I passed by the Chalets de Villy they had a water fountain there. From the Chalets de Villy your next main destination is the Refuge de Moede Anterne. This is a straight trail and it's easy to follow. Refuge Moede Anterne is definitely one of my favorites and after covering the distance between Refuge Berard and this refuge, it is probably welcome place for a break and a snack. From Refuge Moede Anterne head south on the crest trail towards Lac de Pormenaz. You will be visiting the lake and taking the trail on its western edge. From there keep going south towards the Chalets de Pormenaz. There is trail from the lake going westwards in the direction of Les Ayeres and although you can reach Servoz that way too, this particular trail goes over the Pormenaz mountain and through the pastures of the Chalets de Pormenaz. After passing the Chalets you will start your descend of the mountain and pass through forest trails in the direction of Servoz. As you reach the bottom of the steep climb, keep on the right side towards the Tete de la Fontaine and Servoz. If you want to you can visit the Tete de la Fontaine, a nice little snackbar looking out over Servoz. Your destination will be Servoz and there will be signs for Servoz Chef-lieu that you can follow till you reach the little town center of Servoz. From the main roundabout take the roach going to south towards the Servoz Train station. Its a long straight road and there will be signs guiding you to the train station. Once there you can take the train back to Chamonix or wherever you need to go next.