You might want to visit popular sights in the larger area including Shiga Kogen Ski Area.
What is there to do in Mamejima?
Visit M-Wave Olympic Memorial Arena, Nagano Prefectural Shinano Art Museum or Nagano City Museum for a taste of local culture. Some attractions to visit in the area are Chausuyama Zoo and Chibikko Ninja Village. Additionally, you might find Shiga Kogen Ski Area and Sanmon Gate worth a visit.