Four Seasons Hotel Tokyo at Marunouchi -- If money is no object (though children 18 and under can stay in their parents' room at no extra charge), little princes and princesses receive the royal treatment here, including a welcome amenity, child-size robes, children's menus, complimentary toiletries, and bedtime cookies and milk. And for those hard-to-please teenagers, there's even free use of TV video games. The Four Seasons Hotel Tokyo at Chinzan-So has a similar offer.
Hotel New Otani -- This huge hotel has an outdoor pool (which you can use free of charge by becoming a Hotel Club member), but best for parents is the babysitting room for children ages 1 month to 5 years. For a small fortune, you can even leave the darlings overnight.
Imperial Hotel -- This famous hotel makes it easier to bring the family along, with its day-care center for children ages 2 weeks to 6 years, its babysitting service, and an indoor pool, which you can use free of charge by becoming a member of the Imperial Club.
Keio Plaza Hotel Tokyo -- A children's day-care center for children 2 months and older, and free admission to an outdoor pool with children's pool are family pleasers, but if that's not enough, maybe the kids will find it cool to stay in one of Tokyo's tallest hotels.
Shinagawa Prince Hotel -- Japan's largest hotel boasts a children's day-care center, cinema complex, amusement arcade, indoor and outdoor pools, aquarium, bowling alley, sports center, and much more.