I will be in china for the month of May in Sichuan Province, Shanghai and Shenzhen, Hong Kong. I now find I will have about 5 days spare after Shenzhen.
What is the possibility of doing a trip on Li River?
How do I get there and back to Shenzhen/Hong Kong?
Is 5 days enough to do it comfortably?
Should I try to book tour from Shenzhen or do it after arrival?
or should I look at another location for the 5 days?

Thanks for any assistance
regards
Max