Hiked it this afternoon and got caught up in the eruption and 6.9 quake before the park was evacuated. Not the best feeling to be on loose and hollow lava beds when a big tremor starts! The hike itself is pretty straight-forward. Just follow the trail markers and bring water. It probably helped that it was overcast and only 85 degrees. Lots of interesting plants and the $2 trail guide at the visitor center was informative.