http://www.freewebs.com/masterpikachu/ZC%20Content/Test%20Quests/quicktest2.qst
If Link has the flippers, and plays the whistle on a screen with the Whistle -> Dry Lake Flag, he will walk slower than normal on the dry lakes. He walks on the dry lakes at the same speed he would swim in water.
NOTE: This happens with the rule "Links drowns in Walkable Water" checked.