I'm afraid the Lakunai or "East Airfield" no longer exists. After WWII the airfield became to be known as Rabaul Airport. It was located at the foot of Tavurvur volcano, near Matupit Island. The airport was destroyed by the 1994 eruption that destroyed the town of Rabaul.
Lakunai was an alternate airstrip to Vunakanau Airfield.