You have found a house for your groups in the heart of the Alps, here are some suggestions for activities in the area:

Pass Anniviers Liberté

From 30 May to 1 November, anyone staying in the Val d’Anniviers who has paid their tourist tax will be given a pass that provides free access to a range of transport and leisure facilities, as well as entrance to various attractions.

And More :

Pfyn – Finges
Ella Maillart
Fondation Pierre Gianadda
Underground Lake, St Leonard   
Bungy jumping
Mountain Running Sierre-Zinal
The Adventure Forest