The last time I visit Beijing was about 13 years ago. It was not a pleasant trip. After visiting other part of China, I decide to visit Beijing again this April but will go there on our own instead of package group tour handle by travel agency. I wish to visit the Badaling Wall by taxi. We intend to book two taxis or other type of transport that can accommodate 5-6 people. Can someone tell me how to book the taxis and the price.