I'm Indonesian also, and I live in Jakarta. Like others have said so far, it depends a lot on the places you will be visiting. Jakarta is the capital city and it can be considered an expensive city compare to others. Just to give you an idea of the costs in Jakarta, if you stay at 5 star hotels, it can cost you (more or less) around 1 million Rupiahs per night. If you go to a mall and just see a movie and eat at a restaurant/cafe, it can cost you around 200,000 Rupiahs (at least). If you're looking to buy designer stuff and such (like LV, etc), then 5 million wont get you far.
When are you planning to come here? If we can meet, along with other tPFers who live in Jakarta, I say that'll be good..