Whimsydale is the most colorful place in all of Diablo III. It’s got rainbows, and happy clouds. You can find at least one diabolic-yet-cute piñata in there somewhere. There are pastel colored ponies and teddy bears that…. want to kill you.
When I first heard about Whimsydale, I thought it was the dumbest thing ever. How could something so, well, whimsical be part of Diablo III? The whole idea felt wrong to me. Later, after visiting Whimsydale, I changed my opinion. I now find it to be very amusing.