If you want to ski down the mountainside, you'll need to get to the top of it first. Hop on Reiterjoch Ski Lift and enjoy the ride up.
You'll find this mountainside transportation system located in Obereggen. Pay the admission fee and then take your time to explore. Once you've finished up at Reiterjoch Ski Lift, head for nearby sights like Ski Centre Latemar, Karersee and Latemar.