When we went to csa we did the black river tour along with the falls and the appleton estate tour. Non of these would be worth it on their own because of the far drive. So if you wanted to do the river then book it with the other two. It is more than worth the day away if you do all three.
Totally agree with dnbmccann. It's not worth it on its own. It's quite a long drive. If you do it, definitely combine it with others. We did the same package - Black River, YS Falls, and Appleton. I think we left at something like 8am and got back around 5.