Japan-i
When people tell me that they are going traveling to Japan, I always ask them if they have done their homework. If you are not on a tour group and don’t speak the language, Japan will be a challenge. There are the few people who are “travel smart” and due to experience are adept at making their way around the country. But for the other 95% I strongly recommend that you look into all aspects of the places that you intend to visit.
Japan-i is a cool site for newbies. It’s not overloaded with ads and will allow you to learn a bit about Japan. Here you can find general information about Japan, World Heritage Sites, Onsens and much more.
At a glance their forum seems decent, but their events calendar could be updated. When you have a chance, check it out and let me know what you think.