Katie was a fantastic guide! I loved how she provided a thorough and adequate explanation of the island during the tour. She also gives amazing recommendations for where I should visit during the rest of my time in Hawaii. I joined the tour alone, but since the group is small, you won't feel left out. I also liked how we had enough time for each site. I didn't feel rushed and I was able to take my own time and look around and enjoy each spot. It isn't that long either, so don't be worried about being bored.
We were picked up at the hotels around 10-10:30 am (it was later than the description, so we could see lava at the volcano park around 7-8 pm) and dropped off around 10-11 pm. I did the tour in early July and I think the exact schedule might change, so check on them and don't plan anything else for the day. We went to Kona coffee farm, black sand beach, and volcanoes park (crater walk/lava tube) and also saw stars at night. Make sure to bring WARM CLOTHING (jacket/jumper) for the evening! It's very cold and windy in the evening since you are at high altitudes.