Gyosen Park

Train kids can walk through old subway cars, try simulators and see how the whole underground system actually works.

A huge disaster prevention park with broad lawns and playgrounds, so there is plenty of room even on busy weekends.

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.

Family rooms, a large bath and easy train access make this a nice middle ground between central sightseeing and Disney days.

Apartment-style rooms with space for a family to spread out, in an area with easy train access and plenty of everyday shopping nearby.