Michael Cash wrote:
> 
> I spend a good portion of my days being vigilant against crushing to
> death suicidal maniacs in Tokyo, so it might not be too much of an
> adjustment for me to make. I can't really think of any reason I would
> like to visit London [..]

But but but !  The UK is a country unlike any other!
Their food is bizarre and unfathomable by most civilized people's
standards.  They also have a marked fondness for bland infusions
of dried Asian plant leaves.  Fish 'n carbohydrates still seem to
be an important cultural component of their diet. They drive on the
wrong side of the road.  Their electric plugs have a weird shape.
Their industry leaders are always fretting about the negative
economic impact of their overvalued currency vis-a-vis their main
trading partners'.  Their top bureaucrats and business executives
are generally graduates of a couple of "elite" universities.  
Their relations with a divided country west of a narrow sea strait
are still somewhat strained due e.g to ancient occupation grudges.
They still have a "royal" person serve as the country's figurehead,
and the heir to the throne's marriage open car parade is televised
and watched nationwide.  They colonized some hapless Asian countries
in the past, and as a result must contend today with a sizable
population of cuturally alien people on their soil.  Their main
islands' original population has been driven away to the fringes or
eliminated eons ago by uncouth invaders coming from the continent.
Their lore includes tales of warring factions supporting two separate
royal lineages cutting up each other.  Armies of Japanese ladies roam
the aisles of their department stores, snapping up expensive trinkets.
Their now privatized ex-monopolistic state telephone company likes to
browbeat its competitors by finding creative ways to restrict their
access to its infrastructure.  Their industry zones sport factories
of companies bearing foreign-sounding names like Matsushita, Toyota,
Nissan, Hitachi, or Honda.  They are proud of a white-coloured Ferris
wheel that stands more than 100 meters high.  They are sometimes
confused by the subtle nuances of that burdensome language named
"English" spoken in the US.

How much more exotic and different can you hope for as a travel
destination, especially if you're based in Japan?