I had ever go to the great wall of china about 6 years ago. It looked very amazing!!! because it is built along the hill and very very long. In that time I walk and climb to level 5 so I am very tired. But now it has an air cable car that you can see down from your site. I suggest you should both walk and air cable car in the same time. My brother just went to it by air cable car about last month(february 2555) but I had never. He said that it looked very remarkable!!!. I hope you will have a good experience in the great wall of china. Enjoy your trip ^^bye