Since I coordinate volunteers and students at Nazarene Hospital, I am often asked questions about safety in PNG. Well, to be honest there are some security concerns, but we do our best to be careful and prudent. In any country, including the US there are certain places you shouldn't go at certain times or in certain company. It's no different here. We try to follow some practices that we think will help avoid unnecessary risk.
But ultimately, our security isn't in policies, or procedures, or avoiding danger. Our security is in God. Here is a link to a blog by John McHoul, with HeartLine Ministries in Haiti. It says it far better than I can.
Haiti Can Be A Dangerous Place