can provide information about the trip from guilin to yangshuo by boat and how much it cost

It is a wonderful trip from Zhujiang Dock in GL to YS and the fare is around 320RMB per person.
The boat start at around 09:00 and 10:00 every day and it takes about 4 hour son the river.
The best time to go there is from April to October, but it is suggested to aviod the May Day and National Holiday.
These are all the information I know and hope it can help you.