At the Bormio 2000 station follow the S543 to La Rocca. Here you need to switch onto the S542 to Sobrettina before descending along a series of switchbacks through a red spruce forest to San Pietro. At this point, the trail flattens out, and patches of clearing open up to give you panoramic views of the Valfurva. From Campolungo take the S540 down to Feleit and on to Bormio.