Japan National Tourist Organization pretty much covers it all.
Museum Info Japan, there's gotta be one near you!
The Japan Foundation offers a variety of cultural exchange info.
Tokyo Comedy Store isn't Japanese, but it's in Japan!
The Japan Tattoo Institute. In the flesh and to the point...
Japan Atlas has festival dates and maps. Cool virtual tours too.
Japan-Guide covers customs, traditions, annual events and more.
Intl Friendship Football League promotes soccer and culture among soccer fans.
Tokyo Street Hockey for you perhaps? All welcome.
Komae Touch Rugby is looking for new members around Tokyo.
Tokyo Goannas is for the Aussie rules enthusiast's out there.
Namban Rengo is a Tokyo running club... On your marks!
Armchair Olympians here!
Democrats Abroad Japan... Democrats abroad Japan.
Republicans Abroad Japan... Republicans abroad Japan.
Tokyo Toastmasters can help enhance your public speaking!
AFWJ is the association of foreign wives of Japanese.