On the first day, take 9 19 to Deshengmen to Badaling (the first bus leaves at 6:00). It is not recommended to go to the Ming Tombs. When you come back in the afternoon, you can visit the Bird's Nest and the Water Cube (when you come back from Badaling, you can transfer to 83 south from Madian Bridge (under the National Stadium of Beijing West Railway Station-West Railway Station)), and in the evening, you can go to Wangfujing (under Beihai of National Stadium Sightseeing Line 3, west exit of Beihai 103 Street Lamp City).
The next day, I went to Tiananmen Square, National Grand Theatre, Forbidden City (60 seats, tickets are closed at four o'clock), Jingshan, Beihai and Gongwangfu (60 seats), and went to Shichahai and Houhai Bar Street Hutong in the evening.
On the third day, I went to the Summer Palace (45 buildings), Yuanmingyuan, Peking University, Tsinghua, Zhongguancun and Zoo. At night, take the subway to see CBD and new CCTV under Dabei kiln.
At other times, you can visit Yonghe Palace, imperial academy, Confucius Temple, Temple of Heaven, Liulichang Cultural Street, Qianmen Street, Dashilan, Xidan, 798 Factory, Panjiayuan and Xiushui Street.
The hotel can tell you the traffic route.