Great for kids under the age of 10; there was a variety of rooms and activities for both of our children (currently aged 2 and 7), including climbing structures, pretend play, water play, quiet time, etc. We spent a good 3 hours there, and our eldest probably would have wanted to stay longer if we didn't need to leave for lunch!

Admission is currently $21 per person (aged 1 and older), which is not that pricey given how much there is to do and compared to the cost of other major attractions nowadays. They give you a wristband upon entering so that you have in-and-out privileges that day, which is great if you need to take a lunch break or do activities at the Navy Pier in between.

We went on a Tuesday, so it wasn't super packed, and the kids didn't have to wait a long time to get a turn for whatever activity they were doing. If you can swing a weekday, I'd really recommend it, just to avoid big crowds and the associated noise/chaos.

They had employees stationed around the museum to ensure the safety of various activities and to assist families, which was great (we've been to other children's museums, and that oversight isn't always there).