If you just have one day in Beijing or layover here, and want to have the best visit in Beijing, this will be your best choice- “the Summer Palace and the Great Wall Mutianyu Day Tour”.
Firstly visit the Great Wall of Mutianyu (2-3 hours). It's located in Huairou County 75 km northeast of downtown Beijing. This is the most famous and ideal sections of the Great Wall. You will have the panoramic view for the entire Great Wall with the tower 20 which is the highest point above sea 1039 meters. The section here also have the toboggan.
In the afternoon will visit the Summer Palace, this is the only one royal garden were left. Originally constructed in 1750 during Emperor Qianlong's reign as the “Garden of Clear Ripples” (Qingyi Yuan), it was destroyed in 1860 during the Second Opium War and rebuilt in 1886 by Empress Dowager Cixi using funds intended for navy modernization. Spanning 2.9 square kilometers, the complex blends natural landscapes with classical architecture.
Doing this day tour is very relaxed and cultural, especially for family holiday.