Put your trekking boots on and hike up Siltri. Awesome vistas and a sense of accomplishment will be your rewards!
You'll be spoiled for sightseeing choice when staying in Valleve. Siltri is a good place to kick off here, but there are loads of other worthy sights to experience. Foppolo Ski Resort, Brembo Ski, and Piazzatorre Ski Area are near the steep landmass and will fill in your day nicely.