Where do i begin. Mello is fantastic, we camped at san martino at the campsite sasso remenno, and think they take vans. Pretty incredible spot. We were mountaineering on the piz badille and sport climbing, although the boulders are within half hour max up the valley and in a superb setting. On rest days there is great walking everywhere, and some long routes in the valley, luna nacente etc etc. The village of san martino is great for just sitting around
And on the way you must go through Morbegno, which is hilariously twinned with Llanberis.....