Just under a three hour drive north from Montreal you'll find La Mauricie National Park, an area of natural beauty and a prime opportunity to escape from the bustling city. Not a home to huge mountains or waterfalls, La Mauricie is a great in its relative mediocrity in that you aren't forced to go to extremes to enjoy unspoilt nature. When it's cold out, you may snowshoe and cross country ski through second growth forests or or even ice climb with the park's partner outfit, Maikan Adventures. Once spring comes, you may kayak and canoe through the calm waters of the many park lakes or even hike trails like the 17 km (10.6 mile) Deux-Criques, which stops off at the Ruisseau du Fou falls and brings you to the park's best viewpoints. Just be sure to take basic precautions against wildlife like black bear, otter, and moose if you're on the trails or setting up a tent on any of the four campgrounds.
If you've got time and inclination, stop by the nearby town of Sainte-Anne-de-la-Pérade, which is notable for its ice fishing locations and the tommy cod that are frequently found here in the winter months.
This is Canada at a leisurely pace, without the lights and noise of modern civilization. The best part about it is that it's a manageable drive from both Montreal and Quebec city, making La Mauricie for a great area for a day or two of adventure.