If you want to swim all the way from Beijing to the south, are there any good tourist routes?

It depends on whether you like nature or historical sites. Moreover, whether driving or taking a bus, train or plane, it is of course best to drive.

I recommend you go south along Daguang Expressway first:

The first stop is Yuntai Mountain in Jiaozuo, Henan Province. It takes at least two days to visit the ancient city of Luoyang.

The second stop is Qufu, Shandong, and then it will take at least two days to visit Mount Tai in Tai 'an.

The third stop is Yangzhou, Jiangsu, where I visit Slender West Lake and eat Yangzhou snacks for a day and a half.

The fourth stop is Hangzhou, Zhejiang, visiting the West Lake and Jiuxi, and drinking Longjing for two days.

The fifth stop is to turn west, stop at Huangshan Mountain in Anhui Province and visit the houses in southern Anhui Province for at least two days.

The sixth stop is Conghua, Guangdong Province, where we spend two days in hot springs and two days in mountain scenery.

The seventh stop stops at Zhanjiang, Guangdong, and takes a ferry to Haikou for one day.

The eighth stop is Haikou, one day;

The ninth stop is Sanya, Hainan, the destination.