The official currency in Indonesia is the Indonesian Rupiah (IDR). You can exchange money at various locations, including:

1. Banks: Major banks like Bank Mandiri, BNI, and BRI offer currency exchange services.

2. Currency exchange offices: Specialized offices like Travelex and Western Union are available at airports and city centers.

3. Money changers: Local money changers, known as "penukar uang," can be found in tourist areas and cities.

4. ATMs: Withdraw IDR directly from ATMs using your debit or credit card.

5. Hotels: Some hotels offer currency exchange services, but rates may be less favorable.

6. Airports: Currency exchange counters are available at international airports like Soekarno-Hatta (Jakarta) and Ngurah Rai (Bali).

Remember to have your passport and ID ready for exchange transactions. Be aware of exchange rates, fees, and any daily limits when using ATMs or exchanging money. Credit cards are widely accepted in tourist areas, but cash is still king in local markets and smaller establishments.