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I think Discovery Place is definitely worth a visit, particularly if there are younger (under 13) kids in the party. I also agree that the Whitewater Center is a must-see. We've taken every single out of town guest there since it opened, and it has been the highlight of everyone's trip. Even if you don't want to participate in any of the activities, you can just watch the rafters/kayakers, hike or bike around. It's only $5 to park.