Tokyo offers things to do and see 24 hrs in a day. I like taking friends who visit from abroad to Tsukiji Market. Getting up as early as 5A.M. requires some discipline, but the market is a truly awesome experience well worth the effort (and great place to study chaos theory). The photo shows Mirko and I reflected in the back of a spotless Tsukiji truck (presumably loaded with seafood of some sort) at around 7A.M. before heading off for one of the many great breakfast spots there.