The Col de la Chambre is accessible via the 3 Vallées 2 chairlift and (indirectly) via the Bouquetin cabin lift. Both lifts provide access to Méribel, and the Bouquetin lift also to Les Ménuires. The blue Pluviomètre run down to Val Thorens is for some relaxed skiing, and for many skiers it is the last run of the day to get back to their accomodation. The black Marielle run goes down to the top station of the 3 Vallées 1 chairlift, where it continues as a blue run with the name Plein Sud. Plein Sud can be extremely busy by the end of the day, as this is the last run of the day for probably the majority of the skiers.
The Funitel Grand Fond provides access to Orelle on the other side of the mountain, via the Breche de Rosaël (3,000 m). To actually go to the other side, you follow the flat path on the top right for about 50 m. Just before you are there, you usually face strong winds that blow through the narrow entrance. The runs down from Funitel Grand Fond on the Val Thorens side are just for some relaxed skiing, like the descend to Orelle.
Off-piste opportunities are not very good on either side of the Funitel Grand Fond. Especially on the Val Thorens side, the terrain outside the tracks is not steep enough for this activity in most places.
If you take the Moraine and Col chairlifts to the Glacier de Chavière, you should see excellend snowfields on you right hand side just before arrival at the top. At the top, take the regular run and pass the small bar on the left. Right after the bar go to the left and leave the groomed runs behind you. Just follow the tracks of other off-piste skiers. Almost the entire area until the Portette run (Portette chairlift) is available. But as always, be careful because you are skiing on a glacier.
By the way: there are also some limited off-piste opportunities if you keep right instead of turning left. The ungroomed snowfield is next to the groomed run, less spectacular and less steep. Again, it is (partly) on glacier ice.
Cime the Caron (3,195 m) is the highest point of Les Trois Vallees that is accesible by ski lift. The cabin lift is impressive itself as it is huge! Also the span between the posts is impressive, just like the views during the trip and from the top (weather permitting, because it can also be horrible!). The best run down is the black Combe de Caron, but also the red Col de Laudzin is very good. There is also a beautiful run to Orelle on the other side of the mountain.
ONe of the very good things in Val Thorens is that almost all accomodations are ski in - ski out accomodations. Several runs and even some lifts go right through the village.