Around and about Morzine (and Montriond) during the summer:
Lifts up to Avoriaz, Super Morzine, Lindarets & Mossette, Plenney and Nyon. For some great walking.
Les Dereches main swimming complex is open, with 3 indoor and 2 out door pools. There’s even Ice Hockey matches on some evenings.
Parcours (go-ape) below Les Dereches and up the Nyon valley for kids through to adults. The river is great for pratting about in on hot days too.
Aquariaz (indoor water park) is open at Avoriaz and a lot of fun.
Oh, and there’s a few MTB routes too.
Check out http://www.chaletmontana.eu/ for half board options to compare with self catering lets.