【正确答案】Dear Peter,
We're so glad you're coming to join us tomorrow. Here is how you can find us: We'll have our picnic in the People's Park. You know where it is, don't you? After you enter the park by the main gate, walk straight on till you come to a stream. Cross the stream and turn right. After walking for a while you'll come to a lake. We'll have our picnic there in the small woods by the lake. I'm sure you'll have no trouble finding us. Do come!
Yours,
Li hua