If you get any time in the city during the weekend, the City Museum is unlike anything you've ever done before. Be ready to crawl, climb, and slide.
World-renowned Botanical Garden that is responsible for Anna ending up in St Louis in the first place! :)
The best FREE zoo in the country. The animals are cared for very well and there is lots of amazing research and conservation work happening there. The seals & sea lions and the Herpetarium are my (Anna's) favorite.
Great hiking close by the wedding venue!