Official Mont-Tremblant gives you the information on Tremblant activities including ATV maps in Mont-Tremblant.

The Mont Tremblant bush roads are an invitation to enjoy this motorized sport that is ATV. Over the last few years, the Mont Tremblant authorities have maintained and improved trails and also opened new ones. Forests, lakes, mountains, gorgeous landscapes… There is so much to explore in the Mont Tremblant area.

Here is a map of the touristic trails 

https://www.fqcq.qc.ca/carte-interactive/Laurentides?showCircuits=true