As one who has spent a lot of time looking for lost persons, I would say that almost anything you can do to indicate indicate your passage will work -just making conspicuous footprints will be very helpful. Breaking twigs and branches is also useful. If you want to do all out, leave a note with your name, date, and intentions posted where it will be easily visible. I am dreaming, though - I have never seen that in all my years....

This, incidentally, is why signalling with a mirror or whistle is so incredibly useful. You are a much bigger target