This section of the Wall is less well-known among foreign visitors, yet, it’s very beautiful, well-preserved and popular among Chinese people. It is easily accessible from Beijing on the no. 919 bus or by car in the direction to Badaling. More information about accessibility and amenities can be found, among other, at this site.
Here is a map of some sections of the Great Wall. Unfortunately, the Shuiguan section is rarely shown, just like on this one. It may still help those who would like to visit some sections.