If you're looking to get away from the big city, you might enjoy a short trip to the Eastern Townships (Cantons de l'Est), close to the American border. There are many charming little villages in that area, and lots of open countryside. If it's winter, you might enjoy going skiing in Sutton (one of the villages).
There is a bus line (Veolia) that goes to different villages/towns in the Cantons de l'Est (French name for Eastern Townships). It is at Berri-UQAM metro station and the bus goes to Farnham, Cowansville, Sutton, Lac Brome, and Masonville. A round-trip ticket for Cowansville costs $35.69.
Even if you are in the biggest metro region in Quebec,you can still enjoy a good deal of nature! Personally, I go and jog on the St-Bruno montain every 2 days early in the morning and in the summer enjoy canoeing and other activities in the Iles-de-Boucherville parc!
Payment is based on honor and is 3.50 per adult and 1.50 per child. It's important to pay because it keeps the place nice and clean! If you come often, you can buy your yearly pass and accumulate points to get outdoor stuff and get extra points for going in more parcs!
Both these parcs are in the SEPAQ which is the governeing board of provincial parcs.
There's some great hiking around Montréal. Just go to the Eastern Townships. This picture was taken at Mount Sutton's Lake Spruce. The camping there is on platforms and they don't allow campfires so you have to bring a small stove. For more info on Québec provincial parks---
Also: go visit my friend Dominique's travelogue on our trip to the Eastern Townships, where this picture was taken. You'll laugh, you'll cry, you'll have a good time. By the way, she talks about nicknames at some point: hers (The Head) was given to her because she seemed to think a little too highly of herself at times!!!!
For all skiers and snowboaders, one hill I can recommend is Owl's Head. It's cheap, there are hardly any waiting lines and the view from the top of the mountain is breathtaking. You regularly see people stopped on the hills just to soak in the view. This picture was taken from one of the runs.
Click here for more info
They also have a golf course.