Tokyo Subway Museum

The free little zoo is the surprise here, with a playground and garden making it an easy half day for younger kids.

Make this a bigger day with the giant Ferris wheel, wide lawns and waterfront paths, then add the aquarium next door.

The giant tuna tank is the star, and admission is unusually affordable for an aquarium this good.

The easier Disney choice with younger kids, with classic rides, parades and lots they can do even before they are tall enough for thrills.

Especially easy with younger kids thanks to family rooms and direct station access when everyone is done walking.

The huge indoor atrium gives it a resort feel, and the Disney area location keeps transport simple on park days.