If you have some free time, be sure to check out the Dewey Short Visitor Center at Table Rock Dam. Not only do they have an amazing building (and view of the dam and lake) but wonderful exhibits for children. The visitor center is free, but if you muster the courage, consider taking a dam tour. The tour costs around $15 for adults and $8 for children.
Visit their website for more information: http://www.tablerockdamtours.com/visitor-center