The Hakkoda walk gathered about 550 participants(movie) in only one day this year(Web東奥). I was there on the day the traffic opened and went straight to my favorite spot along the road.
Just before the Golden Line starts, there is this tunnel that goes from the road straight to Sukayu.
Related:
GOLDEN LINE in 2007
TATEYAMA-KUROBE ALPINE ROUTE opens up at the end of April. The snow corridors here reach up to 20 meters.