1、Dear ***(填人名）。

2、Nice to meet you again by letter.I am so excited to tell you something about my vacation on May day holiday。

3、I went to Shanghai Science and Technology Museum with my parents. It's so interesting here,the most attraction is the 3D cinema which can bring you to explore the vivid science world。

4、I sincerely to invited you to Shanghai and go there again.I promise that it will give you a happy experience。

5、Best Wishes。