This museum is absolutely amazing. I will always come back and notice and learn something new. My children have a blast every time we come. We have had a membership with the Carnegie museums for 2 years not, and use them quite often.
My favorite room is the mineral room. They have so many, and the displays are so beautiful. My sons favorite places are the dinosaurs and the ancient Egypt sections.
The amount to see at this museum is overwhelming and you should definitely schedule for an entire day to see everything. I would highly recommend checking out their website and the exhibits they offer so you can plan your day ahead of time. They have activities for the kids throughout the day, so keep that in mind when planning.
No food or drink is allowed so make sure you keep a bottle of water hidden deep deep in a bag!
Parking is not too bad if you get there EARLY!
Overall thumbs up and have fun!