Children's Science and Culture Hall Type: Kids/Education (Qjmp: 7004)
Science and Technology Exhibition centre for Kids. History of Science and technology type place, with quite a few things for kids to do and exhibitions to interact with. Not very high tech or snazzy, but the kids I went with enjoyed themselves for an hour or so.
Akasaka Station is the closest. From the junction of Showa dori and ??? walk towards the docks and Nanatsoka dori. Look for a modern building with a large, orange sculpture/figure outside. The science and culture centre is the adjacent, older looking building.