We can sometimes get permission to use the Marys Peak camping area after the campgrounds officially close. This gives an introduction to snow camping without too much snow. By December there is usually enough snow for sledding. There are a variety of trails around the area for use at all times of the year.
Read, see maps, and recreation information at: www.fs.usda.gov/goto/siuslaw/marys-peak on the USDA Forest Service website.