One day is for the central axis, one day for the Great Wall, and one day for neighborhood living. The exact order can change according to weather and ticketing.
Try to arrive early in crowded places
The Forbidden City and popular museums are worth getting up early. After the peak, head to a slower lunch at the park or walk along the alley.
Choose the Great Wall based on stamina
Different sections of the Great Wall vary greatly in terms of time, crowds, and walking intensity. Think carefully about whether you want a sense of history, photography, or a serious walk before booking your transportation.