This Winter you should absolutely spend one of your evenings taking advantage of the Yumeguri Bus. This fantastic service runs from the Hirafu Welcome Centre and will take you out to various hot springs (and restaurants) in the Niseko area. It's an absolute bargain at 500 yen per ride one way, which at the very least will save you a taxi ride!
Onsens are one of the most unique and memorable things you can experience whilst in Japan and Niseko has some of the best of them. Take a ride on the Yumeguri Bus and enjoy this fantastic cultural experience.