I ended up going here on a cheap Big Holiday bus tour for about 5000yen. Not a bad price, considering it was on a weekend. And even though it was a weekend, it wasn't too crowded.
Although not a really big ski-jo, Koumi Re-Ex has a bit of something for everybody. The lower runs are flat enough for beginners to practice turns on while the higher lifts provide some decent challenging runs for the intermediate and advanced. For