Half Marathon in Karuizawa, Nagano.
Half Marathon: 6,500yen, time limit 2hour35mins
Start and Finish point: Karuizawa Prince Hotel Ski Parking Area
5mins walk from Karuizawa Station to the Start/Finish Area and you can enjoy shopping and Yonayona Beer at Huge Outlet Mall after the race!
Also you can go to Tombo-no-yu (Onsen).