Anne Lise P
Google
Around 1:30h to go from Sapporo to this outdoor onsen (by local bus 860 yen each way. The bus stop is right in front of the facility).
It costs 1300 yen to use the onsen, and you can rent towels for around 800 or so (I brought mine). You purchase your ticket at the machine, on the first floor.
You have to go all the way up to the 3rd floor... Keep walking until you see a curtain saying "women" and "men" on your left. Enter there. Once you enter the appropriate room based on your gender, you will need a 100 yen to put it in the locker and get a key. You will collect the money back, after you return the key. Take everything off, place it in the locker , and then you can enter the onsen area. You will need to shower first (Japanese takes showers seating down, so take a seat. They offer only shampoo and soap for you to wash yourself), and then you might enter the onsen either inside or outside.
I had the impression the place was not very clean and it was also a bit scary to walk on the indoor area, where the floor is uneven and slippery.
In my opinion, it was not worth the trip and I would not go back since it had only one very small onsen outside and one inside.
My visit was on a Friday early afternoon, so not too busy, which was good for the size of the facility.