Many thanks to felix.aaa for sharing another photo on instagram. Photo was taken in October 2016 from his other postings. The comment sayswith the photo says:
Keanu was taking a moment to throttle his bike up and down the river.
It’s not clear what publication they are/were for. He has also posted this one on his website (thanks to Ayako for the heads up).
Note: libks to his other photos are here.