假如你是李华，你的美国朋友Mary打算来云南度假，写封回信给她

Dear Mary, I'm glad you could come in yunnan province on vacation.

Yunnan is a good place, I suggest you had better come in April and may

Xishuangbanna is the best tourist resort, where you can understand, and the culture of this part of the dai culture has distinguishing feature very much

You can experience the unique local life, taste of food,

As for the traffic mode, you can sit long distance bus from kunming

May you have a good holiday亲爱的Mary，我很高兴你能来云南度假。

云南是个好地方，我建议你最好在四、五月份来

西双版纳是个最好的旅游胜地，在那里你可以了解傣族文化，这里的文化很有特色

你还可以体验当地的生活，品尝独特的美食，

至于交通方式，你可以从昆明坐长途大巴

愿你有个好假期

嗯，书信的格式你就自己想吧