假如你是Li Ming，你收到你的外國朋友的一封咨詢信：
Dear Li Ming,
     For the coming winter vacation(寒假), my family and I want to spend our vacation in a place for seven days. We would like to go somewhere in China not only warm but also interesting.We don’t mind how far we have to go. It has to be a place where we can swim every day,and it would be nice if our hotel is not
expensive but clean and comfortable.We like to pay no more than $6000 for the trip . Could you please
give us your suggestions (建議)for vacation sports(景點)?
     Thanks a lot.
                                                                                                                                               Yours,
                                                                                                                                                 Robert
     要求：1. 請根據來信內容，從（北京、海南）兩個地方中，選擇一個符合Robert要求的度假地點，用英文寫封回信，提出建議并說明理由；
                 2. 格式正確，80～100詞。

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