Originally Posted by Le Saboteur
But that's why we have umbrella threads!
It's worth noting that September is typhoon season, and you're bound to see a lot more rain than normal. It can also still be quite humid (like it is now).
I stand by my original statement: visit both of Tokyo's Disney parks. They're the crown jewels in the empire. Just remember that they're not in Tokyo, they're in Urayasu. A trip on the train will be required.
Do you like anime? The collected works of Hayao Miyazaki and Isao Takahata? If so, then the Ghibli Museum is worth a visit. They also have special exhibits from other major animation houses. Are you ashamed of your body or otherwise being nude? No? Then perhaps you should visit an onsen (Japanese bath houses). The September Sumo Tournament begins on the 10th, and ends on the 24th.
Otherwise, what are you interested in? I could give you a whole slew of things to do, but they might not be up your alley. Are you into traditional Japan? The Sengoku period? Shunga? Martial arts? Modern Japan? Live Mario Kart racing? The culinary scene? Tanuki? Fox Island? The Shikoku Pilgrimage?
I can offer several ideas, but I'd rather they be more aligned to what you're interested in.
Tokyo Disney is definitely something we've wanted to do for quite some time. It's just a matter of seeing if we have the time and funds to do it. I'm not a huge anime fan but I enjoy the art style and am always up for trying something new. It's hard to know what I want to see because so much of it looks fascinating. I love reading about ancient Japanese history but I also find their modern period interesting as well. I will definitely look into some of your suggestions!