During the Flower and Garden Festival at Epcot, Disney World places 3 or 4 playgrounds around Epcot. Our favorite Epcot playground is the weeblos playground. It can usually be found at the entrance to the Worlds.
Also, during the flower and garden festival they have out a butterfly garden. You walk through one side and then pop out in fairy garden. During this time they also have special concerts and educational displays.