A couple of log rounds tossed into their path, always leaves a good impression. They'll steer away or slow in fear of hitting logs. Sleds aren't any better as far as I see. They tend to drive like crapheads just because they can. Top speed though the hole all smiles and huge wakes. And ten minutes later back down the as*holes go. Thank god for small rivers. If you don't like it then go exploring for smaller rivers. They will never go away. There are no enforce on the water and if there is the cops are on the skis too. J.C.B