Laws and rules in Indonesia are strict. The number one aspect to be careful of is drugs. Many backpackers indulge in the occasional spliff or dosage of party powder. THIS IS A TERRIBLE IDEA IN INDONESIA! Gambling is also illegal. Indonesia is partly a Muslim country - and some regions such as Aceh Regiosn follow Sharia Law. If you're unsure, dress modestly and look at Indonesian law websites or even better, investigate your own country's or Indonesia's Official Gov Website.