The city of St. Louis offers dozens of options for educational entertainment, including the Children's Science Museum. (Not just for kids!)
I went on a date to the museum with my boyfriend and we had a wonderful time immersing ourselves in the challenges and trivia in the museum!
My favorite part was when we attempted to navigate a rover in the Mars Exploration feature. Even with an engineer we were barely able to beat the challenge so I wish you and your children the best of luck if you do decide to explore it!