There's one great Beijing sight I've put off seeing, the Summer Palace. Glad I waited! On our first day of clear blue skies I was able to go, and, since Renmin is near, I was able to get there before the heat (and tourists) arrived. With landscapes of many kinds, it's added a third dimension to my view of Beijing.
These images are completely out of sequence - sorry! But they're true at least to my experience wandering without a map, discovering one gorgeous vista after another.