My highlights:
Sensoji Temple - Asakusa
Shinjuku
5:30 am tuna auction - Tsukiji Fish Market (Must see IMO)
Sony building - Ginza
Harajuku
Shibuya Crossing - CRAZY!
Day trip to Nikko
Take the subway to get around. It is just soooo efficient, and cheaper than Cabs.
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Extreme Q Best Temperature