We had such a great time at Satonotabi Resort Lodge!
We booked tree houses and they had space for us to sleep and store our luggage. They're equipped with smart air con units too, so no need to worry about being too hot or too cold. Only thing I would improve is maybe an extra futon as the flooring is harder than a tatami, so the single slim futon wasn't the most comfy.
But the camp site is beautiful and quiet. The staff is great and friendly, always happy to help. Even better, for foreign travellers like us, they speak English really well so it was the easiest stay of our entire trip.
While we had our own plans to visit the area, there are plenty activities organised / available on site too, and I'd happily come back to try them next time.
Also, the food was really excellent! We took the half board option, and it was one of the best meals we had.
I would love to come back, I had such a great time. Highly recommend the place!