帮我看看我的英语小作文有哪些地方需要修改?

Last summer holiday,I traveled to Beijing with my parents.(用句号,而不是逗号） We got there by train.
We visited many(拼写错误） places （拼写错误,palace是宫殿的意思）there.First,we visited the Great Wall.（用句号,而不是用逗号）It is ( 用is,而不用was,因为这个客观事实）very long and we all surprised at this(这儿最好用this,更加明确所指对象） wonder.And then we ate the Beijing Roast Duck in the hotel.(用句号,而不是用逗号）It was so delicious(拼写错误),and (因为前面用的是逗号,这里加一个and 来连接）we liked it very much.At last,we visited the Palace Museum.(用句号,而不是用逗号)It had many beautiful buildings.（用句号,而不是用逗号） we all enjoyed ourselves there.
What a good trip!

用it is
第二行We visted many places there.
第四行delicious
其他应该没问题

修改过后：
Last summer holiday, I traveled to Beijing with my parents by train.
We have visited mangy palaces there. First, we went to the Great Wall. It is very long and we were all surprised at ...

visited mang palaces there 不对头 你改成went to

it was very long and we all surprised at the wonder改成it is very long and we all surprised at the wonder
长城的长是永远的，不用过去式WAS，是IS