I am a Japanese-Croatian who mainly grew up in Croatia. In the past 10 years, I've lived in 7 countries across 3 continents so I like to call myself a Citizen of the Earth or, at least say I'm from the Northern Hemisphere :)
My favorite place in Japan right now is Tokyo - I love its vibrancy and a global feel.
As a contrast to its hustle bustle, I also recommend Okinawa's rich culture, history and absolutely breathtaking nature.
My favorite recent travel was to Iceland - I LOVE its nature! I also admire (or maybe I'm a little jealous of) their use of the geothermal energy :p