My family cottage is in St. Donat on Lac Archambault. It is BEAUTIFUL!! Our cottage is not winterized, so I've only been in the summer and fall. In winter, there is great skiing.
There is a very nice local bakery right on the main street. The town itself is not very big, but there are restaurants, a marina and a couple of nice mini-golf areas.
Surrounding towns are also very nice. It's not far from Tremblant, so there's a lot of touring to be done. There are also quite a few bike trails.
My Aunt spends all summer there, so if you need anymore specific info, I may be able to get it for you!!