greetings,
i camped at the park campground in january several years ago for 4 amazing days. there was not enough snow to ski, but there was snow everywhere and ice, frozen ponds, even snow at sand beach, a crazy sight to behold for me. a campfire in the pit rings will keep you super cozy before retiring into your bag. amazing night hikes too, especially with a bright moon (no need for headlamps).
there were only 2 other campers in the park the first night there. the next two nights there were no other campers besides us, a national park to ourselves!
there was also no charge to camp. hopefully this hasn't changed?
no need for snowmobiles, main roads were plowed, plenty of access to many trailheads and hikes.