Tokyo, a beautiful city for recreation with children, even if the child is still small and traveling on the wheelchair, or the child is disabled.
Transport infrastructure is very developed in Tokyo, the convenience of moving around the city on the subway with a carriage will not be any work, wide turnstiles, a card throughput (purchase a travel plastic card, throw it for 5,000 yen and use it when traveling by bus, metro, and Also pay it in minimarkets).
Entertainment with children, where and adult will be interested in a lot.
1. Children from 1 year to 12 years - Lego Land to Odaiba. This is the world with a mini-layouts of the attractions of Tokyo / Carousel / Cinema 4G / LEGO designers in unlimited quantities / lazzifices for children / cafes and other entertainment.
https://www.legolanddiscoverycenter.jp/tokyo/en/
2. Disney Land - Children are perfect, but parents love to dilute with Japanese beer, the 3rd version of my offer is suitable http://www.tokyodisneyresort.jp/en/
3. Disney SEA - the sea world of Disney, older children and of course adults will be 100% interesting !!
http://www.tokyodisneyresort.jp/en/tds/
A trip to Tokyo with children is good in any season, depending on your needs.