We love the Kalamazoo Valley Museum and have spent quite a bit of time there in the winter/bad weather. It has a full playroom for young children with tons of things for them to do-individually and activities. M-F at 10am they typically have some sort of organized free event (storytime, etc.) for preschool age children. Then the museum has so much more to offer for older kids-tons of different science experiments they can try. We've never even gotten to the entire museum in all of our visits!
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