We're saying it was a nearly perfect day because we had to cut the hike short when a big storm rolled over just about forty minutes from the end of the hike.
As we were nearing the highest section of the Great Wall at Jinshanling we noticed the approaching storm was getting more and more active, and decided to head down early. Not long after we started hiking down the rain started to fall very heavily, and then the thunder and lightning started up, right over our heads. A good thing we were on the way down at that point, rather than on the way up to the highest point in the area. We then had to take shelter in the park toilets, but the less said about that, the better.
Up until then the hike had been totally perfect! (As you can see from the photos below—big blue skies, long views of the wall, and we had the Great Wall all to ourselves.)