I visited the Great Wall last December with my wife and 1-year-old daughter during a 20-hour layover in Beijing. Ruby, our host, picked us up at our hotel in Beijing and drove us for 90 minutes to the Great Wall. Ruby was at all times a very nice and attentive host. It felt from the beginning she had known us for longer than just a few minutes. The drive was very comfortable, in a spacious and clean Mercedes just for the 3 of us. At the Great Wall, Ruby led us to the entrance, bought our tickets, and left us on our own for more than 2 hours. When we were done, we messaged her again, and she waited for us at the exit to bring us back home, and we still had time to sleep for 4-5 hours at the hotel before going back to the airport. The Great Wall was an amazing experience. It was a bit cold, normal for December, but it was quiet without being crowded.