Marucube

Great place for seasonal fun

Marucube in Marunouchi is part of the Maru Building, and the open space serves as both an entry to the various floors as well as an event site. At the moment they are hosting an illumination event that is Super Mario themed, so if you (or maybe your kids) have any interest in the Mario franchise then I'd absolutely recommend stopping by. The proximity to Tokyo Station is excellent and there is plenty more to see and do in this part of the city.