The Iles de Boucherville are located on the South Shore of Montreal, right after the tunnel. It's a 20 minutes drive that will brings you completely outside of the city and transport you into a land of wilderness and nature.
The access is quite easy. You just have to take the exit for Ile Charon on the highway 20 and then you'll see pretty good information for the entrance of the park.
To go at the boating renting point, you need to follow the direction for Iles Grosbois starting from the parking lot and the information desk. It would take approximately an hour by walk to reach there or 20-25 minutes by bike. The path is quite easy and you'll need to take a small ferry to go on the main island. Once at the Grobois information center, you have the possibility to rent kayak, canoe or rabaska. Since I was with my mom and there was a tour activity that day, we decided to do rabaska with 18 other people. We went on the water for about 2h00 and visit inside the channel up to the marecage.
On the way back, I suggest making a small detour up to the Ile aux raisins which is a protected area where you can have a lot of pretty view and enjoy a good picnic outside.
There is an entrance fee of 8,50$ to go in the park if you don't have your annual SEPAQ membership.
For more information on the activities: http://www.sepaq.com/pq/bou/
Also, if it's your first time in Boucherville and you want to go for a snack after a good day outside, I totally suggest the Saint-Laurent Cafe (https://www.facebook.com/saint...) which makes awesome grilled cheese and smoothie !