Jiuzhaigou park is probably the most beautiful place I have ever been to and I have been around! I was there during the winter of '01. If you go then, you should be prepared. It was extremely cold and there was not much in the way of comfortable accomodation, either in or outside of the park. Freezing your tail off is no fun, but the frozen waterfalls, unbelievable mountains, and multicolored lakes made it worth it. The only way to describe it is otherworldly.