The Steaming Bluff
If your itinerary doesn't let you walk the whole way around
the crater, I suggest you walk the distance from the Volcano House
to the Jaggar Museum. If you do you will view an excellent variety
of climate and habitat.
Part of the way along the route is the amazing phenomenon of the
Steaming Bluff. Inexplicably this bluff tends to be about the highest
part of the rim and is on the far side of where you expect the heat
to be (if you check the map to see where the active Pu'u'O'o is).
Also along this route is the trail head for the path down into
the crater. Even if you do not wish to walk the crater, I strongly
recommend taking this path down and back.