It's That Great
Visiting one of the Seven Wonders of the World makes for a good day. Head to the Mutianyu Wall location, known for fewer crowds. We unintentionally went on a horrifically polluted day in March, but that made for zero crowds and some moody photos. We only stopped roaming and climbing when we could no longer see the wall as it steeply ascended into the "clouds."
Be sure to take the toboggan down this UNESCO World Heritage site, and stop at the School House on your way out of town for some delish food and an on-site glassblowing studio. http://www.theschoolhouseatmutianyu.com