This weekend is the Tokachi Trail Running event in Shimizu.
Also, I just got the application, off of Twitter of all places, for this year's Shikaoi Trail Run.
It's the second running of this event and this year there are three course.
A 5k, 12k and 23k run.
It is held at the Kawakami Kanko Noen, a sort of touristy farm where you can do horseback riding, strawberry picking and you can eat the fresh dishes at the restaurant there.
The Shikaoi Trail Run is October 23, 2011.