Pumice Hills
They are hills, which are pumice. Walking up them is exhausting.
Moonscape
A virtual moonscape of pumice has a bizarre, stark beauty.
Trees
Trees and plants have trouble growing from sprouts in pumice because the surface drains so well that it retains no water. I believe these were planted as seedlings with established roots.
Ravine
A ravine exposes the stratigraphy of pumice and volcanic ash.
Some strata are particularly preferred by birds which excavate a great many nest-holes. I assume they are seeking out some optimal combination of softness, rigiditiy/strength, and grain size.
Trash Heaps
Some individuals who don't want to pay the fee at the local dump, and who were not raised right by their parents, dump their trash here instead.
