We will be in Guilin from 5/18/2015 (gets in very late at night 9:45pm)

and we will leave 5/20/2015 by 11:10am flight.
We are planning to do one day tour of Li river cruise on 5/19/2015. Do we have enough time to do a short sightseeing in the morning of 5/20/2015 before our flight? If so what would you suggest? There are 4 adults.
Thanks.
Kyung