KUNMING, China—With foreign vacations off limits, China is in the middle of a theme-park boom as domestic tourists seek amusements in their own backyards.
In Wuhan, the epicenter of the initial Covid-19 outbreak, thousands of people packed the Maya Playa Water Park in mid-August for a pool party, banishing memories of the 76 days the city had spent under strict lockdown until early April.
To…