Or at least something that looked like a bamboo raft. They are actually made from PVC tubing but they look similar. We got collected from our hostel at 10:00am and taken by bus to Yangdi Pier. Along the way the tour guide who spoke reasonable English gave us some info on the area and the things of interest to look out for during the cruise on the river. We lucked out and got the front seat on our raft which was 1 of 6 in our group. It was nice to be on the water, despite being the middle of the day a breeze kept us cool and the scenery was just what I expected and hoped for.
The bamboo raft cruise from Yangdi Pier to Xingping (where another bus took us to Yangshuo) lasted about 2 hours and was one of the highlights of my trip.