WDW is a great place for young children--especially if they are familiar with Disney movies/characters. In addition to the UG, I would recommend the Disney with Children guidebook. I found it invaluable the first time we visited with our kids age 3, 5, and 7 in 2000. Have fun! Now that our kids are older, it's almost sad to watch my husband try to persuade them to ride Snow White or Pooh when there are the mountains to conquer. Enjoy Fantasyland and the rides/shows for young children while you can!

My 11 and 13 year olds no longer want to "waste" time waiting to see characters. Luckily, my daughter is still into it. From our pictures, it looks like she went to Disney without her brothers.