If you're staying in a private residence (not a hotel), you must register with the local Rukun Tetangga Office and local police on arrival.
Decisions of Indonesian immigration officials are final. If travelling on an Emergency Passport, you'll only be allowed to enter Indonesia if you have a visa from an Embassy or Consulate of Indonesia.
Since January 2016, a number of threats have been received by Indonesian authorities from groups purporting to be planning attacks, including in Bali.
The terrorist threat level in Indonesia remains high.
Attacks could occur anywhere, anytime, including at locations frequented by Westerners.
Example: On 14 January 2016, terrorists attacked a Starbucks Cafe and police post in Central Jakarta, detonating bombs and exchanging gunfire.