Check out Hakuba Cortina. Hilarious bubble era relic of hotel at the base.
http://www.powderhounds.com/Japan/Ho...a-Cortina.aspx
Adults can maybe drive over to Happo One for one day of skiing, which is 30 min away.
I went there once when they supposedly got 50 cm of snow while Happo got 20 or 30. However, it was like cement, so can't call it powder skiing.