Traverse the entire main wall in either direction. It's a little easier (IMO) from left to right, and that's the way I did the FA. You can go as high as you feel comfortable - it's not an eliminate.
This problem changed a LOT after the fire, when the whole base was raised several feet and the course of the stream changed - when I did the FA, falling off resulted in a thorough drenching in the stream for most of the traverse.
Crux (the actual V4) is in the general area of the start of "Moat Pump". There are enough jugs throughout that the pump factor isn't *too* bad here, but it all depends on how high you're willing to go. It's entirely possible that there's a V2 way to do this traverse hidden somewhere among all those slippery holds, but I never found it.
The best traverse in the entire area. I can't believe people waste their time on the Playground traverse instead of this.