The zoo is free!! And lots of fun!
TONS of fun for kids and adults. Wear something comfortable. It is a maze of a bunch of weird stuff. Wear out those kids so they pass out at 7! Also fun for adults who still have the ability to climb and twist your back. Get the roof pass, soooo worth it.
Need some lunch? This is one of the best (maybe THE best) place for sandwiches in St. Louis. Do yourself a favor and stop by for a little nosh.