The What If Labs are the area of the Imagination! Pavilion you enter, upon exiting the Journey into Imagination with Figment attraction. In this area, there are two things my children particularly love. First is the Melody Maker. Guests can use their arms to create music, which is actually the melody of One Little Spark. Joey goes all out as if he is conducting and orchestra! Now that my children are all tall enough to reach to play around here, it is one of their favorite things to do in Epcot. On previous trips, I have had to hold Emily up to be able to test this out.
The second part of the What If Labs that my children absolutely love is the Stepping Tones. Children get to jump tile to tile. Each tile has a different musical instrument on it. If they land on the tile when it is lit, they hear the instrument sound. On a rainy day, this is a great place to get a little energy out while staying dry! My kids look forward to playing here every trip. Here is a quick video of the kids jumping around (this is from our 2010 trip when they were 5, 3 and 2). Emily loved copying everything Hayley was doing!
There are many places to enjoy Disney magic on rainy days, but for my children, at their ages, this spot is just right for us!