Welcome to Guizhou! Guangdong is definitely the first choice to take Guiguang high-speed train when coming to Guizhou. You can go to Duyun first, and you can visit Seven Small Arches. After that, you can go to Qiandongnan Xijiang Qianhu Miao Village and Zhenyuan, and then go to Anshun Huangguoshu Waterfall. But four days is a bit hasty. I suggest staying for a few more days and enjoying the beautiful scenery of Guizhou.