I took the kids to see the Bob the Builder exhibit that's on at the Children's Museum.
They had no idea who Bob the builder was. The exhibit didn't clear this up, which I found a little surprising. There was a weird attempt to teach the kids about energy conservation, which went totally over both kids' heads. They enjoyed playing with the various tools, though they did not understand why certain things could be climbed on and certain things couldn't (me neither!) And certain things moved and made noises (eg the saws) but others just looked like they ought to but didn't (cement mixer).
But ignoring the attempts to be educational and just treating the place like a playground seemed to work fine for our purposes.