This isn't Hokkaido, but in planning my next trip, I came across this place in the Kirishima National Park in Kuushu.
単純泉と硫黄泉、2種類のお湯がお楽しみいただけます。 旅行人山荘敷地は5万坪、恵まれた自然に囲まれています。桜島を正面に雄大な風景が望めます。 Hotel Ryokojin-sansou.We're located on the hill in Kirishima.Can be seen from the all guest room with wonderful views.You can enjoy open-air bath(rotenburo) privately with your family or friends for 45minutes free.
ryokojin.com
If you follow the links to make a reservation:
https://www.489pro.com/asp/489/menu.asp?id=46000012&lan=JPN
You'll find pricing per person, per room, minimum 2
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Is this type of pricing common? At first I was pretty outraged (wanting to book a room for a single but being asked to pay x 2), but looking at the hotel, and the price, the regular price for the room would be Y24,560, or about $206 - not expensive.
I guess its the simple way to charge for extra people in the room?
Anyway, is the 'per person' system common in Japan? I've never struck it before, anywhere.