Lake Ashi is huge and had nice views. Theres the trip on the lake in the pirate ship, the viwe of Mt. Fuji (if your lucky), the floating Tori gate, the shrines and maybe a bit of shopping at the souvenir shops. Once you've seen quite a bit of Hokane, relax at a local onsen. You can do a day trip to Hokane if you are short of time..