dear OP,
too bad u didn't like your stay here in japan. having said that, i am interested in the TONS of businesses that had signs stating "no foreigners". you must have been very unlucky coming across so many establishments that declined foreigners, especially since we who live/lived here don't seem to have seen more than ten together.
noodle, where i live no tourists ever come, and i can't say that ppl stare at me. but perhaps i am just too grey.
on the number of foreigners in tokyo: 386,000
source