I know this titel is not everybody's taste. Kind of family visit, and we are not young anymore. However we will stay in Annupuri from 8th - 22nd February with some daytrips to other places and may be overnight stay away from Niseko. Asarigawa Onsen might be nice? And of course Rusutsu and Kiroro. Andybody can recommend anywhere else along the cost - if there is a nice local rotenburo with see view that would top it up.