Update:
Well, it looks like we will be riding in the park on the 12th-14th and skiing at Big Sky on the 11th.
We will ride at Big Sky on the 10th. If anyone can recommend some riding areas to go to that would be fun, we would like to rent some real mountain sleds and try riding on real hills. Are there any volunteers to show some midwestern riders how and where to ride hills? Any recommendations on where to (or not to) rent sleds?