You can always just duck behind the person in front. Also, keep your feet up against the edge to keep your shoes dry. This. The only time I ever remember getting soaked on Splash Mountain, it was after the big drop and water sloshed into our boat.
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Keep in mind that Guests must be 40 inches or taller to ride, and you WILL get wet. If you don't want to get soaked, request to sit in the back row. If you do want to let Splash Mountain live up to its name and walk off soaking wet, then request to sit in the front row.
For Splash, just take thin flip flops in a backpack, change shoes in line, put the sneaks and socks into a backpack, then change back after riding. If your entire group will each have their own backpack, perhaps one of you will have a lot less room than others and can dedicate that bag to store the shoes in.
Bring a dry stash of clothes or a towel. Some people (aka, ME) have been known to dry off (as if that was even possible) with the hand dryers and paper towels/tissues in the girls room. That was awkward. Think ahead and stash a set of clothes in one of those trusty waterproof zip top bags!
Splash Mountain is known for its famous drop that looks over the Magic Kingdom and Kali River Rapids has it drops and waterfalls that are known to get people soaked. If you were to wear a poncho, these would probably be the two that I would suggest. These rides are more focused on their famous drops and spills.
Splash MountainBe prepared that they usually put larger passengers in the back. There's no seat belt, just a log you step down into and sit on a bench. You will get wet, so this ride is a great time to swap out your shoes to sandals, if you haven't already and you brought an extra pair.
While there are height requirements, Disney World rides do not have weight limits. We reached out to the Magical Kingdom for confirmation! Disney World assured us that no theme park attractions have weight limits. However, many rides feature restraint devices which may prevent some guests from being able to ride.