How to visit Beijing for the crowded season

Summer is the most busy time for tourists. So we need to enjoy Beijing but not the crowded people. 

I would say please don't visit great wall Badaling section. As it is the wall of people. There are so many parts available. Like Mutianyu, Huanghuchen great wall, Juyongguan pass, Jiankou section. 

Summer palace is also full of people. Beihai park is very good choice where you can feel imperial garden with much less people.