Papua New Guinea has over a thousand different tribes, about 18 per cent of the country is urbanized and the rest is still covered with thick jungles. There is no road connection between one town and another - the only option is to fly.
Papua New Guinea is not a very safe country to visit. You must be extra cautious at all times. Generally, if you are staying at any hotel, someone will accompany you always - I had two armed guards with me. A bit of a bother, but a safe option.