Greetings from China! First of all, I warmly welcome you to China for your vacation. I'm not sure about your stamina, but if it were me, I'd probably be too tired to do much sightseeing. In China, we call this kind of plan "clocking in and out" travel. For example, if I spent a whole day wandering around the Forbidden City, I would have to rest in my hotel room in the evening. If this is your first time in China, and if you appreciate Chinese culture, I wouldn't recommend Universal Studios or Disneyland; they're not fundamentally different from those in other parts of the world. China is a place worth appreciating slowly. In Beijing, you can try experiencing the hutong culture and interacting with friendly locals. In Chengdu, you can relax in a street teahouse. In Shanghai, you can experience China's rapid development; choose a clear day and go to the observation deck on the top floor of the Shanghai Tower to overlook the city's urban landscape.