假如你是张胜，在暑假里和父母一起到北京，请根据下面的行程给你的笔友埃里克（Eric）写一封邮件，向他介绍你的北京之旅以及你的感受。
行程：第一天：天安门广场（Tian’anmen Square）;故宫（the Forbidden City）
第二天：颐和园（the Summer palace） 第三天：长城（the Great WALL）
要求：1。词数70词左右（开头和结尾已给出，不计入总词数）；
2.语句通顺，结构完整。
Dear Eric,
I went to Beijing with my parents last week and we had a good time there.
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When you are free, welcome to China and we can visit these great places together.
Yours,          
Zhang Sheng