I want to go to Shanghai Happy Valley tomorrow, but there is a thunderstorm, so I can go.

First of all, there have been thunderstorms in Shanghai these days, so outdoor activities are not recommended.

Secondly, the outdoor projects in Happy Valley are closed when it rains, that is to say, roller coasters, jumping machines and so on. All large-scale projects are closed.

So, don't come. It is so boring. Come back when the weather is fine. You can call me if you need a guide, hehe.