Oh and, the bigger the splash, the better.
In DBZ there are huge splashes, but they don't have to be THAT big, just try not to make it a little wussy splash....Better yet, have the splash be as large depending on how fast the player travels through the water. Cause if it was big it would suck trying to sneak around in the water slowly and as soon as you slowly enter the water a huge splash comes out of the water. Would be also cool if you flew right above the water there would be water trail spraying behind you, and over land a dust trail. But as Joe said, those are just luxury, finish what is needed first then do the extras!