Off-topic: Yomiuri Shimbun operates its own theme park and it's an absolute delight, especially during winter months when there's a spectacular light show during the evenings. I prefer it to Tokyo Disneyland because there's plenty there to occupy young children but with reasonable waiting times.
Give it a try on your next visit to Tokyo. I recommend arriving on the cablecar - almost feels like you're descending into Jurassic Park by helicopter (wife gets quite annoyed when I predictably start humming John Williams).