What to avoid in Jakarta?

Places to be Cautious in Jakarta

Ciliwung: This is Jakarta's biggest slum and hence, has a lot of social instability. ...
The Ancol Port Area: This place has the highest crime rates in the entire city and is also a base for many of the frauds and scandals that run rampant.

Can you wear jeans in Indonesia?

Although you'll see Balinese and Indonesians in jeans, you may find it too hot and humid to wear them yourself. I would suggest you take cotton/linen trousers/shorts, or light summer dresses/skirts. Perhaps match it with a chiffon scarf and you'll look fabulous.