If you got to japan and only ride 4 days you will want to kill yourself when you get home. Ditch the 2 plankers, go to japan on your own, ride every day, have a life changing experience, become a slave to japanese powder for the rest of your life, die happy.
^^^^ what this dude is saying
the first time i went to Niseko i had 4 days on the slopes. after i went home, all i could think about was how to get back there ASAP
if you've done Whistler 4x already, then you must do Japan