At the time of writing it was quite possible, if quite silly and risky, to hike to the top of Tavurvur and peer into the hissing and spitting collapsed crater (two-hours return). It's a hot, steep, and exposed scramble so leave early, take plenty of water and wear gloves and good shoes. We do not recommend this activity and your travel insurance probably forbids it, but the local guides are keen and knowledgable.
The newly born black rocks are loose, crumbly and razor sharp. The Vulcanology Observatory issues warnings when they observe subterranean disturbances, and these are posted up at the Rabaul Hotel, but they would never claim to be fool-proof. The direct route from the Hot Springs is steep, while the southern slopes, reached by canoe from Matupit, provide a gentler climb.