This is a small island off the North West of Hokkaido. My friend and I rented mountain bikes and cycled round the island (Roughly 50 miles or so I think) and I also cycled up a HEP service track until it turned into boulders which my non elite skills didn’t allow me to surpass.
It’s a really pleasant, if wind swept place, with lots of wildlife (see the seals?) and nice photo opportunity. With more time, and in mid to late summer, you could climb the mountain.
If you’re ever in the area you should go for sure. However, make sure to take food like I didn’t. I ended up eating “food” so processed it had more in common with acrylic furniture than anything edible.