Loved Tokyo. Such an easy train system to get around in. Taking the Yamanote Line was the easiest thing to do. Top place was Harajuku and Shibuya. Harajuku has great shops for young people, particularly girls, and you must try the famous crepes! Shibuya is fantastic at nighttime and again has great shopping and lots of eateries. Akihabara is also entertaining and Asakusa too.
Insider Tip:Get a Japan Rail Pass if you are visiting many cities in Japan and using the Shinkansen (Bullet Train)! No fussing with tickets and you can make it worth the money if you travel around enough. Try and get a backpackers near the Yamanote Line cause that has the most attractions. Visit KiddyLand Always see Shibuya at night