What attractions are worth visiting for a 60-something American couple visiting China for the first time?

There are many attractions for Americans to choose from when they visit China.

One, the cultural landscape can choose the following attractions:

Beijing Forbidden City, Temple of Heaven, Yonghe Palace, Summer Palace, Yuanmingyuan, Simatai Great Wall, Zhoukoudian; Xi'an Qin Shi Huang Terracotta Warriors and Horses;

Two, the natural landscape can choose the following attractions:

Anhui Huangshan Mountain, Emei Mountain in Sichuan Province, Jiangxi Three-Qing Mountain, Guizhou Huangguoshu Waterfall (July), Zhangjiajie, Xishuangbanna.