It is autumn in October in Beijing. Autumn is my favourite season. It's cool in autumn here. The sky is blue. Many people visit Beijing in October because Beijing is the most beautiful in autumn.
During China's National Day holiday, you can visit Tian'anmen Square(天安门广场). There are many beautiful flowers everywhere. You can climb the old Great Wall. It's long and high. In October, you can see the colourful leaves in Mount Xiangshan.
There are many things to do in October in Beijing. I am sure you will have a good time.