Where in Hokkaido are you going to? If going from Osaka to Sapporo, it would take you over 12 hours by train - you will arrive exhausted and almost dead. And returning the next day? That makes no sense. You could fly there cheaply in 90 minutes-2 hours one way. http://www.jetstar.com/jp/en/home http://www.flypeach.com/pc/en
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What exactly are you asking?
Where in Hokkaido are you going to? If going from Osaka to Sapporo, it would take you over 12 hours by train - you will arrive exhausted and almost dead. And returning the next day? That makes no sense.
You could fly there cheaply in 90 minutes-2 hours one way.
http://www.jetstar.com/jp/en/home
http://www.flypeach.com/pc/en