The park was very informative but, due to the flows and the air quality, much of the park was closed during our visit. Be aware, if you try to go down to the road that was covered by lava flow, you cannot drive to it from inside the park. You have to walk about a half a mile past where the road is closed.
You can go to the other side of the lava flow (outside the park) to see the flow at night. The area is all private property and there is a road closed sign, but it is open for viewing. Apparently, the state has not taken down the no entry signs. We were informed by locals that the sign was incorrect and that you could drive down the one lane road over the lava to get to a parking area about a mile in. From there you can see the flows at night in the distance. Just bring a flashlight because there is a short walk. There are locals available from 3 - 9 each day to assist you with questions or talk about the lava flows. There are numerous houses here that are living 'off the grid' due to no services (power / water) and the locals seemed very nice about all the visitors, just dont block the road or their driveways and stay on the main road. Although its all black lava rock, under that rock is private property, so respect their property rights.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.