Travelling through Indonesia takes time. It doesn't look far on the map but it was about 18 hours from Jakarta to Yogyakarta. Mostly riding the train at night.
I have been teaching English as a second language for over 20 years in Japan and Canada. What keeps me in Japan is the love of its culture, which constantly surprises me. I am also fascinated with "alternative travel", or "travel off the beaten path". Ferries and trains are my mode of choice... airplane for convenience.