From a legal angle a footprint in fresh snow is simply evidence that you were there. On public land it’s fine, on private property it could be treated as trespassing, especially if the owner objects. Quiet‑enjoyment clauses protect against noise, not footprints, but any visible disturbance can be a nuisance claim. So if you want to leave only the scent of pine, stick to public trails and avoid stepping on other people’s property.