My twins were 3 the first time we went to Epcot, and they loved it then. They are 6 now, and it's still one of our favorites, especially at night. Like the above poster, we usually hop there a couple of nights during our trip. Things they enjoy: The miniature trains in Germany, running around the maze in the UK, The Seas pavilion, Test Track, the ride in Mexico, the jumping fountains in the Imagination Pavilion, the dancing fountains, the light-up side walks in Future World, and dancing to the various performers. They used to love Off Kilter (sigh). They love the drummers in Japan. Club Cool is a favorite. There are so many meet & greets there, too. And the food. They love the caramel shop in Germany. We've wandered through Innoventions a couple of times. The fire safety and money saving areas were fun for the kids, very interactive. And it is so much more fun during Flower & Garden. There are a couple of playgrounds set up, the topiaries, and a butterfly tent. It's my favorite time to visit. We haven't done the Agent Perry thing yet, but I think we will on our next trip.