Well, I know we've got a race coming up in Chuncheon in April that can still be signed up for. http://www.run1080.com/game/game_index.htm?code=482
You'll need a hand, as it's all in Korean and costs 20,000 to register for. If you get asked your shoe size, or it's 30,000, it's the wrong race!
Sunday, April 17 ∑ 9:00am - 12:00pm
I'm a little shoddy on the details, as I have yet to register. Not sure how long it is, but it's a run not too far from either of us (I'm next to Inje in Gangwondo). Chuncheon should be no more than an hour or two by bus.
Are you UP or LP? I'm a Wisconsin kid, and I've been up north, but never across the bridge on Mackinaw Island to the southern half.