Tourists take selfie amid vervain flowers in Haigang District of Qinhuangdao, north China's Hebei Province, July 24, 2018. (Xinhua/Yang Shiyao)

A little boy plays at an urban forest park in Dongcheng District of Beijing, capital of China, July 22, 2018. The park was open to the public on Sunday. (Xinhua/Luo Xiaoguang)

Tourists enjoy themselves at a water park in Lianyungang City, east China's Jiangsu Province, July 21, 2018. (Xinhua/Geng Yuhe)

A father and son play on the beach in Rizhao City, east China's Shandong Province, July 21, 2018. (Xinhua/Yu Fangping)

Tourists enjoy prairie scenery on Shentian Prairie, which is located on the border area between northwest China's Shaanxi Province and southwest China's Chongqing Municipality, July 21, 2018. (Xinhua/Shao Rui)

Chidren read a book at a bookstore during the summer vacation in Wuyi County, north China's Hebei Province, July 22, 2018. (Xinhua/Zhu Xudong)

Visitors surf at a water park in Jianhe County, southwest China's Guizhou Province, July 20, 2018. (Xinhua/Yang Jiameng)

Tourists ride horses at a lawn in Weining County, southwest China's Guizhou Province, July 15, 2018. People enjoy their leisure summer time by getting close to the nature. (Xinhua/He Huan)

Tourists have fun at a lawn in Weining County, southwest China's Guizhou Province, July 15, 2018. People enjoy their leisure summer time by getting close to the nature. (Xinhua/He Huan)