As there are many attractions in Shanghai, I will list you some popular view sights and hope you enjoy yourself in Shanghai.
The Bund 上海外滩 Oriental Pearl TV Tower 东方明珠电视塔
Shanghai Museum 上海博物馆 Nanjing Road 南京路
Zhujiajiao 朱家角 The Jade Buddha Temple 玉佛禅寺
Yuyuan Garden 上海豫园 Xin Tian Di 上海新天地
Madam Tussauds Shanghai 上海杜莎夫人蜡像馆
Shanghai Happy Valley 上海欢乐谷
All of the above attractions are valued to visit.

I suggest you spend two days in playing the games you are interested in.

The hotels near the valley:
Shanghai Vienna International Hotel, Le Mridien Sheshan Shanghai and Shanghai Yuanfeng Hotel among others.