You can't be too big for this. At Universal Studios Islands of Adventure, there is an entire section devoted to the wonderful world of Dr. Seuss. The world created many years ago by Theodore Seuss Giesel comes to life in a way only a major motion picture company like Universal can do. The entire area is a splash of storybook colors and sights that we all grew up on.
Take a ride on "One Fish, Two Fish, Red Fish, Blue Fish" pictured above. This ride is similar to the "Dumbo" ride at Walt Disney World. There is also the "Seuss Trolley" (you can see the tracks above and also the "Caro_Seuss-el", a carousel full of all the cool characters that only a wonderful storyteller like Dr. Seuss could create. There's also the "Cat in the Hat", a ride through the story depicting everything you saw in the cartoon.
Take the kids to eat at "Circus McGurkus" under the big tent. It's fast food but the entire area is for the visitors ten and under and they will enjoy it. Have some Moose Juice! It's cool.
When you have a day at Islands of Adventure, the little ones will enjoy it all. In the warmer months there is a little water park where they can play and get wet. Great fun for them.