It just happened again, bryanf! (I takes perhaps 3 ~ 5 so those with a URL are not sent to a moderation queue).

But you have some sage advice - it can be windy and very cold at many wall sections, and depending on people's preferences, they can prepare best by reading and choosing what they want - from the bad (feeding small live animals to lions at Badaling) to great hiking, reconstructed vs. "as is", etc.