We took the tour on Aug. 1 and Alana was our guide. The tour was GREAT and I'm so glad we took it as it give us a great idea of what the entire island had to offer. You can see from the other reviews how great the sights are, however, I'd like to add a couple of things.
One, the ride from Kona to the Coffee farm is ROUGH as far as twists and turns. If you get car sick you may be ready to throw in the towel before you get there. It gets a bit better on the way to the bakery, and better after that. SIT IN THE FRONT if you are prone to motion sickness or take Dramamine or something similar.
Two, we missed the lava tubes. I'm not sure why but know we sure had time to make an additional stop to get some dude on the tour a Coke at a random bakery on the way to Akaka Falls. This took at an additional 20 minutes or so. Alana never even mentioned that we were missing it, and I didn't realize it until the end. That was quite disappointing as she kept mentioning "we were making great time" throughout the tour. I feel like you need to hit the stops ON THE ITINERARY before any additional stops are offered to the guests. The rest of us weren't even asked if we cared if we stopped.
The tour was great, but know your itinerary before you leave to make sure that you hit all the spots the tour promises. Respect the other guests and arrive back to the bus on time.