we have a three-year-old and he had a blast. There is a bug exhibit to walk through that is big statues of insects. there is an area called The Dinoterrium and there's little play areas for the tiny kids there. There is also a geyser tower where they can get wet. There is a playground, they can ride the train and I think there is a barnyard area, but we didn't make it there when we visited. Hope this helps!
Theres a trian ride and picnic areas theres even a boat pavilion but if you on to climbing moutain have walk with baby its a pavilion to rest half way.
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