I stayed in Yokohama - and found that I spent a lot going to all the "cool" clubs in Tokyo all night, sometimes spending over 1 hour going from place to place. Communication issues, plus I was going on 'rumor' I researched on the internet. I guess, a book would have helped instead... just be cautious of the meter in the cab - it clicks up fast and the trains stop running at about 12

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Sorry, no self-promotion allowed