Wuzhishan Grand Canyon River Rafting is the longest one with 6KM in about 2-3 hours and very challenging one, but it opens only on weekend and public holidays.
Rate per person is CNY198/person including insurance, operating time is 9am till 4pm. If your shoes are not good for rafting, then please rental sandals at CNY10/pair plus CNY10/pair as deposit which is refundable.