Tsukiji is open to the public, but there are procedures that make it a bit complicated (http://www.shijou.metro.tokyo.jp/english/market/tsukiji.html).
If you want city life, Shinjuku, Harajuku, Shibuya, and Akihabara are all good places, but there's not much going on at 6am that I know of. Roppongi Hills or Tokyo Midtown might be interesting for their architecture alone, and you can wander through those before the stores open. And the skyscrapers in Shinjuku are kind of neat (I love the Metropolitan government building and the weird cocoon looking building looks, um, like a giant weird cocoon).
You could always go out to see Tokyo Sky tree. It's not open to the public until May, but it's new and novel and there's a Mr Donut not too far away from the subway station. *And* you'd get the bonus of experiencing rush hour on your way back from the edge of the city.
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Tsukiji is open to the public, but there are procedures that make it a bit complicated (http://www.shijou.metro.tokyo.jp/english/market/tsukiji.html).
If you want city life, Shinjuku, Harajuku, Shibuya, and Akihabara are all good places, but there's not much going on at 6am that I know of. Roppongi Hills or Tokyo Midtown might be interesting for their architecture alone, and you can wander through those before the stores open. And the skyscrapers in Shinjuku are kind of neat (I love the Metropolitan government building and the weird cocoon looking building looks, um, like a giant weird cocoon).
You could always go out to see Tokyo Sky tree. It's not open to the public until May, but it's new and novel and there's a Mr Donut not too far away from the subway station. *And* you'd get the bonus of experiencing rush hour on your way back from the edge of the city.
I'll continue to ponder.