One is a hand poled ride down the Yulong river, and the other is a motorized ride on the Li river. The Yulong ride has various starting points, the farther up river the longer. The scenery is less dramatic than on the Li river, but the ride is very relaxing as it is propelled by a boatsman hand poling it downstream and over a series of short weirs. There are many local folks selling various things along the river including drinks, pictures, and many floating rafts with bbq to stop and eat on. More "touristy" indeed, but quite beautiful.
The Li river ride is on a raft made of pvc which looks like bamboo, and has a motor on it. It generally goes from Xping up to close to Yandi, then back- basically along the most scenic part of the river. The scenery is much more dramatic than the Yulong river- high karasts towering on both sides, interesting formations with creative names to them, and the spot from which the scene on the back of the 20 yuan note was taken, a small island where you can stop for a photo of the scene.
Both raft rides are recommended to do. One tip- you can have the Li river virtually to yourself for at least an hour if you are on a raft by 8 a.m. This allows for an excellent chance to see numerous water buffalo, and of course pictures uncluttered by other rafts!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.