假如你是申宁,跟据下面的提示,给你的好友王东发一封电子邮.（英语作文）!

Last week, I went to a park with my friends. When we entered into the park, we met a American sutdent who traveled to China for a holiday. I chat with him and then I showed him around in the park as a guide. We enjoyed the time together and he bought a lot of things with my help at the gate of the park. The American firend felt very appreciated with me. Then he left, I went home. I felt it's a very meaning day to me, for not only I had chance to practice my English, also it made me very happy to help the others.