Beantoo,
No need to go back to Port Moresby, drop your passengers off then head just a little further North to Tokua - AYTK
(the replacement airfield for Rabaul).
It has a good sealed runway, plenty of parking on the apron, a control tower, Jet A1 and Avgas (Interoil).
Never had a problem with security, its not raskol country there yet.
The field is regularly serviced by Air Nuigini F100 jets.
It has a GPS RNAV approach.
By prior arrangement you can clear customs and immigration there if you want to give Port Moresby a miss.
Dont fly near Rabaul, volcanic ash is often still emitted.
For nearby accommodation, you can't beat the Rappopo Plantation Resort, run by a couple of Ozzie expats (Brian and Bev).
They will shuttle you to and from the airport.
Look up Rappopo Plantation Resort on the web.