Just a quick reminder, the annual Snow Festival is currently taking place in Sapporo. Unfortunately, I could not make it, but a friend of mine is there right now. Follow her blog and have a look at the amazing snow sculptures which are exhibited in the Odori Park.
Otaru/Sapporo Snowfestival by Plane83.
Sapporo is also worth a visit in the Summer. I visited Sapporo and other parts of Hokkaido last August.