You’re going to get the most wet if you sit on the front two rows since you’ll be getting the brunt of the mosasaur splash. Even more if you’re on the sides because on the second to last drop, water will splash into the boat.
You’ll only get grazed by the mosasaur splash if you sit on the third row. You’re pretty much going to get the least wet if you’re on the 4-5th rows.