I have a 6 and 2.5yr old and they loved the place. You can spend a whole day there if you want to. Get off at Omigachi station and follow the signs posted showing kids plaza. Its less physical play and more learning and interaction. My kids loved role playing at the stalls, Supermarket and tv studio the best. Science area great too. Missed out on the arts and craft area as it closes an hour earlier which was disappointing. You can leave to go and buy food to bring in and eat. Mos burger is our favourite fast food in Japan and is just across the road. As others have mentioned there is a large park and play area behind the building. Kids plaza recommended on rainy days or if you want a break from sightseeing.