In addition to the owls, the Horniman Museum had a bunch of really cool stuff. There were instruments on display from all over the world, and several for the kids to play with.
There were also several outdoor instruments
This one's an instrument too, I guess you hit the different pegs...
And in addition to the instruments there is apparently a natural history museum, an aquarium, and on Wednesday at least there was a punch and Judy puppet show.
This museum is the most random by far, but apparently the kids LOVED it.