Ideas for a 5 to 7 day hike in Japan [closed]

In august I will be going to japan. After visiting a friend, I want to go on a trekking for 5 to 7 days.

Ideally I would go to Hokkaido for that, because then I can leave my stuff that I do not need for the trekking at my friends house. I would also escape the warmer climate of the main island that way.

I was wondering if anyone had any tips of where to go for a nice trekking. I prefer to go somewhere where it is not too crowded.

In the lonely planet "hiking in japan" book, the "Daisetsuzan grand traverse" is described. I've found a lot of information about it on http://www.idioimagers.org/Daisetsuzan-guide.htm already, and also plotted the route out on a map (used the UUD maps that can be used with Garmin devices)

For who's interested:

GPX file: https://drive.google.com/file/d/0B3M3QULFICJwdmdZR3JoRlotTEk/edit?usp=sharing or view on google map: https://maps.google.com/maps?q=http://gpx2kml.com/public/2014/03/16/skcmfexpj_Daisetsuzan.kml

As you can see when you view it on Google maps or in google earth, it's quite a tough route. It almost goes all the way over the highest ridges, so I guess it can become quite a ordeal when the weather turns bad. I think I will be able to do this hike (I've done trekking where I've gone 25KM with 1000m altitude difference and 20KG on my back before), but I'm not sure I would enjoy it if it's this hard.

Are there any less demanding hikes around, I would even prefer not going to higher altitudes, but have a bit more forests on my route. I will bring all gear to be self supporting (tent, cooking gear, sleeping gear, etc..), since I prefer to avoid huts.