My first winter camp was at Valens Conservation area with some Ontario hangers. Here's the
trip report. Went out again with them a few weeks later. The same group plus others went on a spring
canoe trip to Algonquin and are planning a
fall trip to Algonquin.
With regards to insulation, you could use a combination of sleeping pads and makeshift underquilts. For top insulation, again, a sleeping bag supplemented with wool blankets can work. This of course is heavy and bulky and appropriate for when a vehicle is near. I'm certain we will be getting together at Valens again this winter and of course you'd be welcome to join us if you don't mind the drive to Hamilton.