One of the great surprises we had on our Tokyo trip of May 2019 was the teamLab digital art installation in Odaiba. They have 2 in the area and we went Boarderless.
Now normally the phases "digital art" means I have to be dragged kicking and screaming, but I took a chance and was amazed by the place - and think young kids would love it too. Get on YouTube to get an idea.
The other one is called Planets and it is having an upgrade / new installation put in at the moment, and both are on our list to go to next year.
EDIT - they are revealing tomorrow what new stuff is going into Boardless, and it also won a Guinness world record:
timeout/tokyo/news/t...qzgggj-tdTADOM
Also the area it is in has some huge shopping malls, a huge Toyota car showroom / exhibition space with interactive exhibits kids would love, ferris wheel for great views of Tokyo Bay and the city, a giant "life sized" Gundam robot.
There is also a small water science museum there that gets great reviews as having interactive fun for kids, a Trick Art museum (hard o explain but uses force perspective to make things look bigger / smaller - looks quite fun!
There is also a man made beach there that looks quite nice if you fancy a walk on the sand.
It also has a Hilton hotel there, which appears to be far enough from the city to not have tiny rooms, but their prices are cheaper than the Hilton in the city, and a 20 min or so train ride gets you to Tokyo Station and the Imperial Palace area.
Time from there to Tokyo Disney (Miahama station) is about 16 mins.