A great tip we received is that there is an unfinished road from Puerto Natales to Torres Del Paine. A few of the bridges are out, but a determined cyclist can do it in about two days. Awesome scenery and no traffic at all. Torres Del Paine is indeed one of the most beautiful places in the world, but it is a long way from anywhere else. To get there you should to the whole tour (caratera Austral and on to Ruta 40 through Patagonia). It was very hard, but a trip we will never forget.