I think the safest option is to take your shirt off, and flail about trying to put it over your legs. Stretch legs apart to make a rudimentary web between your legs. Then avoid all water bodies, and hope to hell you are for some reason landing near snow. Aim for a big snow drift or powder covered mountain and try and hit it.
My thoughts are that if skiiers and snowboarders can fall over 100 metres with only scratches if they land in powder, it would be much safer than land or a lake say. Sure, at that height they are only travelling at just under half the terminal velocity of the skydiver, but it is a much better result than landing on anything else. The key is to land flat on your back.
Probably very unlikely to work, but with nothing left to lose id give it a go and pray someone came to dig me out. Why people jump off 100 metre cliffs on purpose is beyond me, that takes a real adrenaline junkie.