Would agree with much that has been posted here.
But a comment about Ambon - which I think could be applied to many places, including cities in the US. There has been violence there. Some people kill other people and then blame it (justify it) on some kind of relligious or political motivation. Actually they are just rabid murderers. These brutal murders can occur at any time.
Police and medical services may not respond as quickly and efficiently as you are used to. They may not behave in the way you might expect - for whatever reason. Phone systems can be intermittent.
So take a few minutes to consider Plan B - what you would do if you found yourself feeling uncomfortable or with a medical emergency? Do you know when flights leave?
Now you are properly equipped, you know how to behave, you are not going to walk around dripping gold, diamonds and currency. You will earn respect from those you meet, and if you have a problem, you know how you are going to deal with it.
And I have just described how I approach a trip to Houston - or rather I would avoid ever going there again. The most threatening place I have been. Texans? I've met some on my travels and they've been good people.
Enjoy your trip.