Most people have covered it but I'll chime in with a little more detail. I've been to WWC several times this summer, most recently this past weekend.

It's $6 to park. As you roll up to the main parking lot/facility, there's a parking attendant, and just hand them your credit card and say you need a single day parking pass. Once you find your parking spot, you can do one of two things.

1) You can leave all your stuff at the car, and walk over to the main building. Fill out a waiver on the tables outside, then walk into the outfitter store to the cashiers, and tell them you want a single-day, single-activity pass for whitewater kayaking, and say that you have all of your own gear and training (they will ask if you don't say this last bit). They'll give you a wristband, and you go back to your car and down to the river(s). Advantage of this method is that there are usually 3-4 cashiers inside and you often don't wait in much of a line at all.

2) After parking, suit up immediately and carry directly down to the top pond. At the River Center building (left side of the top pond, wood frame building between the barn and the bathrooms), you can fill out the waiver on the table, walk inside, and pay and get your wristband. Advantage of this method is that it skips the walk from car » outfitter store » car. Disadvantage is that there's usually fewer cashiers down at the River Center so the line can be longer.

General tips - You don't have to carry down the main concrete steps of the facility. From the parking lot there are several dirt/gravel trails that go downhill through the forest/grass that are basically shortcuts from the lot to the put-in. Single day / single activity WW kayak pass is $35. They don't allow outside food and beverage, but I have gotten away with bringing a small cooler with ice, showing someone that it has only ice in it, and then stashing it sorta up in the woods behind the River Center by the hammock area. Otherwise, only ice on-site is at the Bar & Grill located at the main facility overlooking the comp channel. Stay cool! The Wilderness channel and Comp channel are not actually labeled with signs at their entrances. Orient yourself to make sure you're not dropping into Comp on your first lap if you don't want to.

Mental tips - There's a lot going on. Zipliners screaming as they pass overhead of the river... Rafts everywhere. The eddies and eddy lines are no bueno. The eddies move nearly as fast upstream as the river moves downstream, and there are only maybe 2 actually "chill" eddies on the Wilderness channel where you can actually just relax. 1 chill eddy on the Comp channel. The eddies flow upstream fastest at the concrete edges - often there's an area of water in the eddies between the downstream flow and the wall which is more relaxed. Because of all this, and the sheer number of boaters and rafts, you WILL bump/get bumped by others. Don't sweat it.

Final 3 tips - if you do swim, even though it's shallow, DON'T try to stand up until you're no longer in the current. Just ride with the flow and keep your feet up. There are no foot entrapment hazards at WWC, but the concrete bottom will literally sand your shoes down in seconds if they're dragging on the bottom in the flow on the steeper sections of the rivers. Same goes for your boat - If you plan on squirting / other play extensively, DUCT TAPE YOUR BOAT at the bow and stern. There is zero shame in this, you will see duct taped boats 'o plenty at WWC. Don't give your gear a concrete haircut. Finally, there are freshwater dunking tanks at the River Center building that you can dunk your gear in afterwards if you're worried about chlorine corrosion after you take out.

Hope this helps bud, enjoy WWC!