Rusutsu
Rusutsu Resort (ルスツ) is considered one of the best ski resorts in Hokkaido. It has a large ski area that covers three mountains, each having a variety of long runs with a good mix of groomed trails, great powder and tree runs. It is located close to Lake Toya (Toyako) and is just on the other side of Mount Yotei from Niseko. The side country here is truly outstanding but a guide will be needed to ensure that you connect back to the lifts.
Guide: Hokkaido Powder Guides