Of the three tour companies I booked on my trip to the Big Island, Hawaii Geo Tours was the winner, no contest, beating out some more established competitors. Hawaii Geo Tours is owner operated by 2 geologists and certified tour guides, Erik and Zane.
If you want someone to explain the geology, flora and fauna , these are the guys.
On my tour with Zane we made at least 5 different stops within Volcanoes National Park (highlight is Kilauea Caldera) , plus another 6 or 7 outside the park. I was able to see Waipio Valley, Kahuna Falls, a few epic ocean lookouts with rock arches, explore lava tubes plus catch the beautiful sunset on the drive home. I decided to skip the coffee farm to spend more time in other areas, but you can decide what particular areas you want to visit on a private tour.
Also, the price of the tour includes a sit down lunch at a nice restaurant plus all the snacks and drinks you want.
Everything is first class, including the clean Mercedes Sprinter vans.
Zane takes great pictures and videos and shares then via Dropbox after the tour.
Whether you book a private tour with your own group or go with the regular tour, I am sure you will be happy you chose Hawaii Geo Tours, I certainly was.