帮我看看这句话能不能修改地更美更没有语法错误?

The Shanghai zoo is bigger than what I thought before. I thought that it is just a place for children to enjoy, however, it really astonished me when I was there. I was not only surprised about the various kinds of animals, but also discovered the fascination of this meropolis(我可能会用city). There is a zoo in my hometown which is a middle sized city, but it cannot be mensioned in the same breath as this one.
最后一句不太明白,我按我的理解翻译了一下.
The advantage of the big city such as Shanghai and Beijing is the ability to obtain plentiful resources. Therefore, the zoo in Shanghai can eaily attract a large amount of people by the all kinds of animals it generated around the world.
尽量不要用太不常用的单词,把自己想表达的意思说明白比较重要.我的语法也不是很好,希望对你有点帮助.谢谢，我想表达一个大都会的意思。还是谢谢你。