So a friend is visiting Indonesia in September. She asked me for travel tips.
Since she said my answer was 'really helpful' to her, I'd just copy-and-paste it here.
General travel tips:
1. Have your documents (passport, ID, etc) copied and ready.
2. Let a friend at your hometown check on you every once in a while.
3. Have cards with important words (airport, hotel, how much, doctor, etc): in your native language on one side, in your destination country's language on another side.
Indonesia only:
1. Avoid wearing short bottoms (skirts, shorts) at public places on your first visit. If you've visited that place before and people wear short bottoms there, then you are free to do it on next visit.
2. Our food can be too spicy and/or too unsanitary for foreigners from first-world countries. Prepare accordingly.
3. We call any Caucasian 'bule'. It's read boo-lay. Not derogatory, unless tied with swear words.
4. Sometimes we call you 'londo'. It's read lawn-though. Same as above.
5. We have mosquitos. A lot of them.
6. We have some men who don't want to shake hands with women for religious reasons. Not a lot of them, but you might encounter them as a group in social settings.
7. September used to be the time of climate changing, from dry season to rainy one. But thanks to global warming, I don't think you'll need any umbrellas in September.
I'll add more later if I find something new.