United States of America

Definitely Samuel H. Boardman State Park, Brookings, OR, USA
external link

north us. west coast

Also think its cape flattery, part of an Indian reservation close to Olympic NP. In any case looks like Washington/Oregon..

the Grey Havens in the Lord of the Rings ?

Despite being from the U.S. Northwest, I'm going with the west coast of Vancouver Island on this one.

big sur?

Pretty sure this is Samuel H Boardman State Park which is north of Brookings on the Oregon coast.

What do you think ?

Oregon Coast -> external link

canadian westcoast or oregon, yes

That looks just like Cape Flattery in Washington!

Maybe Japan, northern Hokkaido

It's Oregon

looks like canadian westcoast...