As one Japanese and exchange student in Indonesia, I wanted to know mysterious island "Jawa" . Bringing 30L backpack and small sub bag, I decided to trip some big town to see people who live there. Now I live in Bandung, so start from there, use bus or train, stay at 6 places and at last go back to Bandung.
Buy small sweet in bus. Many sellers enter in the car and pass some food or magazine to every passenger selfishly... If you don't want to buy, you just return it to the seller when he come near your seat again.
I stay here for 1 night. There is locker for each person, but this room is available for women and men. When I stayed, only I and one man in this room. Fortunately he is good person, but if he was not good person, I will scary to sleep here.