请帮忙检查一下这篇英文短文有没有什么错误,
I had a happy summer vacation.I went to Olympics Forest Park.We visited Beijing National Stadium.As we say Bird's Nest.It's very huge and beautiful.It had held the opening ceremony of the Olympic Games and is going to hols the closing ceremony of the Olympic Games.I also visited National Aquatics Center.As we say Water Cube.It is colorful.I like it very much.And then we saw the Grand Fountain.I felt very excited and happy there.