My favorite spot in all of Tokyo is not one that you would normally think of. No, it is not a large shrine like at the Nikko Temple or one of the dozen of multistory electronic shopping centers; although the Sony store is quite amazing in its own right. While it is considered a tourist attraction, the place is also practical for tens of thousands of people every day. That is the world famous Shibuya scramble crossing, one of the world's largest cross walks.
The district of Shibuya is one of Tokyo's more famous regions, with the popular Meiji Shrine nearby as well as neon signs in just about every place imaginable. With one of the busiest subway lines in Japan, the mass entrance and exit of people produce the biggest crossing I have ever, and probably will ever see. Estimates for how many people cross during each exchange is disputed, but I would not be surprised if it broke 1,000 every crossing (~500/minute average).