People enjoy the 7-D Theater at Happy Valley Shenzhen. [Photo provided to China Daily]

Happy Valley has continued renovating to provide new offerings, he says.

The Shenzhen branch spent 300 million yuan ($45 million) this year to upgrade its Hurricane Bay, where visitors experience virtual roller coasters in a multidimensional cinema and engage in interactive games. The haunted house features Tibetan elements.

The Shanghai branch also upgraded its water and land parks. It now offers a multimedia live-action water show and a family water park.

Visitors can use one ticket in both Beijing and Tianjin until the end of August.

Wuhan offers a seven-dimensional dome-screen cinema and a five-dimensional virtual roller coaster.

Chongqing will open a Happy Valley in 2017 and a new park is planned in Jiangsu province's capital, Nanjing.

"Each park takes a particular theme," Li says.