On Jurassic Park I have heard other people say they didn't get very wet. I was sitting in the front row, so i got pretty wet. On Dudly Do Right, I got drenched. And on Popeye, I might as well have jumped in. I was soaked head to toe. There is a place in the middle of the raft where you can put your socks and shoes or anything else you don't want to get wet. A poncho will probably help, but don't expect to stay dry. Hope this is helpful.
Been there, done that, going back!!!