Does the ride; Raging River, at Six Flags count? Been there, done that. Was a breeze.
Never done the real thing, but I've heard that 3-4 rated can be pretty rough at times. So, you went yesterday, or is it next Saturday? Whichever, I hope you enjoy/enjoyed yourself. I'd love to try it sometime, but I probably would start in a class 1 or 2. Hmmm. Would the water even be flowing at that level?

Hee hee!
Take care.