We used to ride in Dubreuilville a lot, they have the 100 mile loop just north of town, more like the 100 mph loop! The Iris Lake trail is another great ride. The trail to Earnies across Dog Lake in Missanabi for the best burger in Ontario. Also ride the Magpie Reservoir for an 18 mile drag race and a short cut to Wawa. There is an old rail line that runs across the badlands north of Wawa straight across to Hawk Junction that is a good one too. I think its the Blue Bird restaurant in Hawk, giant burgers. Heck all the trails in that area are incredible. They are already grooming in D'ville. Check out "the groomer guy" on his website, he does a lot of the grooming and is a great guy, Luc.
http://groomerguy.blogspot.com/ He has a bunch of great you tube videos as well.
Watch out on the Magpie, it has a habit of eating pistons and cylinders. Mo at Northern Lights Motel used to keep a running tally of the brands and carnage on the website, NL motel is not open in the winter any more. That area is the greatest riding we have ever done. Also you can go off trail pretty much anywhere outside of the towns, it is all gov. property. If you do any night riding it can get incredibly cold, I have seen it almost 30f in the day and -40f at night, the same day. Wawa Motor Inn is a good place to stay, big fireplace, bar, good food, gas station across the street. If the snow is really deep the Moose use the trails in some areas. There is the Moose loop you can ride if you go to Earnies, you see them over there pretty regular. Enjoy your trip, lots of pics.