After a lot of research I booked a private tour with John Chang of www.hereisbeijing.com. It was one of the best decisions of my Great Wall tour, because he was super informative and very fun to talk to! Very affordable, too. He made sure my mom and I were always comfortable and even caught up with us on the Wall using a "secret path" after the entrance people wouldn't let him in.
Everyone has already talked about the great view that Jinshanling has compared to the other sections of the Great Wall (Mutianyu and Badaling). From Jinshanling you can see the Wall winding up and down the mountains like a giant stone dragon. Amazing.
But just as important -- there are practically no other tourists here!! If you've been to the other (highly congested) tourist spots in China, you know how important this is. Went during July 2015 and saw only a few other groups.
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