We stayed at the Yongdingmen Hotel while we were in Beijing and we were able to set up a ride through them to the Great Wall at Mutianyu during our initial days in the city. This video shows portions of the car trip to Mutianyu. It was quite a distance, perhaps an hour or more to get there, but ride was interesting. Later, we took a bus on our own to the Badaling section of the Great Wall and that was MUCH more challenging.
Related Posts:
Places to Visit in Beijing: Trip to Badaling Via the Great Wall Bus (video)
Things to Do in Beijing: Lydi Doing Taekwondo on the Great Wall (video)
Places to Visit in Beijing: A Bridge and Touts at the Great Wall (video)
The Great Wall at Mutianyu: Photo Gallery
The Great Wall at Badaling: Photo Gallery