Free Foot Spa
At the Takayama Green Hotel complex they have a free foot bath that uses the hot onsen water that sprang from a spring when the hotel was being constructed. The water has medicinal benefits and is very relaxing after a day of sight-seeing.
Also, in the doors to the rear of the foot onsen is the largest souvenir shop in Takayama. The hotel has a huge gift shop where you can pick up all sorts of things.