How can we book one of these Pearl River night tours?

We are 2 x adults, over 60 years old, in transit from Brisbane Australia to London on China Southern Airways. We arrive Guangzhou 16:55 hrs May 14th, we will need information on how to get to the wharf from our hotel (as yet unknown) and the cost, also the night river cruise cost per person and how long is the cruise etc.
We look forward to hearing from you soon. Thank you very much.
Margaret and Mike Mabbutt.