If you want to ski down the mountain slope, you'll need to make your way to the top of it first. Hop on Zirmbahn and enjoy the ride.
You'll have sightseeing choices galore when staying in Nauders. Zirmbahn is a good place to start here, but there are many other worthy places to visit. Reschen Pass, Bergkastel Cable Car, and Nauderberg Castle are close to the mountainside transportation system and will fill in your day nicely.