Popeye is the one that soaks you, the others are ok.
Right before you get on the ride, take of your shoes and socks. Ball up your socks and hold them in your hand, then put your shoes back on. For guys, you can take your shirt off, that is, if it's warm out. Put your shirt and socks in the middle. If they let you put your shoes in there, then do it. But the recording states you must have shoes on to ride, so it's a toss up as to whether the ride ops will let you put your shoes in the middle. If you are forced to wear shoes, then hold your feet up as the ride starts. The water splashes in and fills the bottom. It fills with water after the big drop. When the ride is over, walk out and then put your shirt and socks back on, there are benches as you exit.
If you held your feet up as the water splashed in, then your shoes will be fairly dry.
The $5 locker to the left as you walk in is a good idea. Bring a change of cloths with extra shoes and socks. Don't wear sandals or flip flops in the park, they are hard to walk in. If you're gonna get soaking wet then do it with an old pair of sneakers. Then you can change to your good ones after you're done.