What are all the secret courses in Wii Ski?

The only one I have found so far is the Bigfoot Canyon referred to in the course details. You start at the top of the Elephant course, and immediately bear hard left towards a cabin. Keep skiing past the cabin to your left, and there will be a large dead tree. Ski to the left of the tree, and you will go down a narrow path along the fence on your left. There will be a hole in the fence that you ski through. It is a hard, but very cool course.