We've had a membership at COSI for years. No matter what the kids' ages there is always tons of stuff to do. They can go back in time, go under the sea, play with water, lift a car with leverage, ride a centrifuge, learn about weather, build a kooky creation out of computer parts, and learn and try and experiment. The cafe is pretty eclectic, but expensive, with real food and junk food. The gift shop offers a mix of cheap junk, and some really fun and inventive toys/games. The restrooms are clean, and the staff is terrific. The IMAX movies are usually fascinating, and there is way too much to see and do in only one day! They also offer Girl and Boy Scout adventures, so check it out if you are a troop/den leader.