What are the good attractions on the original journey from Chengdu to Guangxi Beihai by self-driving in December? How many days will it take?

It takes at least two days to drive to Beihai, one day from Chengdu to Guiyang, one day from Guiyang to Beihai, basically one day during the day. There seems to be no scenic spots along the way. I was on my way at the time.