Whimsical Waters is one of the five boards in Mario Party 10. It is set in an underwater lagoon. Dragoneels appear on the board and have their own minigame where players need to choose a chest. The mid-boss fort is a giant Cheep Chomp, while the castle at the end leads to a fight with Blooper. This is the only board where both the bosses are both in mega form. Most of the board's gimmicks have to do with Dragoneel and Underwater events.
The board is mostly the same in Bowser Party mode, albeit with the usual gameplay changes. However, in both the Dragoneel minigames and the ink-obscured path branches, Bowser gets to see the contents of each chest/the spaces on each path before using the GamePad to try and misdirect his opponents with stamps and drawings.