I booked to do the one day volcanic national park trip with the company in mid-September. We had to be at the store for 6.30am but it wasn't too long a drive from my hotel (Kona Coast Resort) and there was plenty of parking on site so I was able to leave my car there all day.
The group size was small and our tour guide (Justin) made everyone introduce themselves at the start of the day which was great-a very simple thing but something that doesn't always get done! It was a long drive to the NP but we had a great little morning tea to break up the miles. The food was lovely-lots of variety of snacks and beverages. We went to the Thomas Jagger museum first and had a look at the craters within the craters. We then checked out a lava tube and did a short walk on the lava to get closer to the crater. We then drove to the sea caves, had lunch (great food, again), checked out another crater, stopped at a tourist centre and then went to the black sand beach (where there were turtles!). We also stopped for a number of photo opportunities along the way. We covered about 300 miles in the day and llearned a lot about the history of the park, as well as the science behind how it was formed.
I was expecting a little more of a serious hike but if I had to choose between walking for three hours and seeing everything I saw, I'd pick the later. The company seems well run and very well organised. I received a call the day before, confirming the time and place to meet, which was appreciated.
On the gently sloping downside, I think perhaps the price could be a little cheaper. I paid $180ish and I think $150 would be more reasonable. But overall though, I was very happy with the service that I received and the knowledge that Justin shared.