Located inside forest park it's a free museum with paid attractions, imax or the discovery room. Park on the forest park side and walk across the walkway to get to see more of the museum and have free parking! Discovery room is great for young kids. Cafe inside for lunch or snacks.

It's an outdoor musem where kids can climb on trains, old fighter planes and tug boats. There's a creation station room for fun play and you can have birthday parties there. Also a room of old automobiles. Great for a nice weather day if you want to be outside in a "museum" Fun for all ages and adults.

Huge train store with train tables set up on two floors. Family fun night first friday of the month brings in a crowd with face painting, cookie decorating and tables of trains for hours. You can have birthday parties there also.
 

Great idea for lunch or breakfast while visiting saint louis. It's a cafe and coffeeshop geared toward kids and toddlers -- with indoor toys, climbers and even a kids bathroom. You can get grown up food (quiche) and kids food (cheerios) all at the same time. Trendy and fun, they often have storytimes and playgroups on their calendar.
 

A great place for adults (without kids) and kids of all ages. Mosaic animals, three story slides, airplanes and buses hanging from the sky. Entrance includes crafts. Cafe indoors. Cheaper after 5pm and open till late (1am) on Saturday. You can get married there or just go for the face painting. They have circus shows every few hours. Don't need to pay for parking, you can park on the block. Expect to stay 3-4 hours.