一篇英语短文,帮忙看一下有无错误.(初中）

一篇英语短文,帮忙看一下有无错误.(初中）
Dear Mrs brown
The summer holidays are coming .Everyone in our class has different plan .let me tell you something about it .Some of us are going to have a trip and relax themselves ,some of us will stay at home and study hard ,and others are going to do more exercise to keep healthy .As for me ,I want to go to the world Expo.I think the world Expo must be wonderful and exciting .I believe I will have a good time .I hope you can also have a good time .
Best wishes to you !
Sincerely
XXX