The next day, to go to the Temple of Heaven, Tiananmen Square and the Forbidden City, just take the subway.
On the third day, I went to Yuanmingyuan and Summer Palace, but time may not be enough. The Summer Palace will transfer you to 1 day. There is nothing in Yuanmingyuan. You can go or not.
On the fourth day, go to the Bird's Nest, the Water Cube, and put it away from your place of residence. You can visit for more than half a day, and you can go back to rest in the afternoon! ! You can leave me a message if you need a specific route, and I'll check it for you! !