While some of the craters along the way or just tree-filled pits, most of what you'll see are vast quarry-sized craters with smooth bottoms of now-cool lava.
Along the drive, you will see the Kiluea Iki trail, which we didn't have time for, but looked awesome; the Thurston Lava Tube, and some great views of the buildup of lava flows in the whole area and the ocean.
When you reach the bottom of the road, there are latrines (bathrooms without plumbing) and a food stand. You can get cold drinks and sandwiches/snacks here before walking up to the lava-covered road.
It's only about a half mile or less to the part where the road is covered, and there are reflectors to mark where the road runs under the cooled lava flows once you walk out on it. We went 200 yards or more out and we could see distant steam from where the lava was entering the water actively. The hike out there would have taken hours though, if not all day; so we didn't continue on.
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