Taxi for Mashu Lake

Hi, next July I'lle be to Mashu Lake, Bihoro, Mt. Io, Sunayu but I know there isn't eco-passport in this time so I need a taxi bus for the places.
Someone can give me some e-mail address please?
Thanks

I think you can take sightseeing taxi which will cost about 20000 yen for 3 hours, 50000 yen for 7 hours.

Instead you can take this sightseeing bus, 5600 yen.

https://japanbusonline.com/en/CourseSearch/10100300003