This was one of the best tours I have ever been on while traveling. Ask for Jim for your guide/driver. There were two buses in our group and after exchanging notes with couples on the other bus, we were fortunate to have such an engaged, knowledgable and enthusiastic driver. Jim shared information with us the entire trip. He knew about the lava types, history, culture and astronomy.
After the beautiful sunset at the summit, we headed down for some star gazing through a 11" telescope. Jim gave the overview of the various stars and planets, we spent about an hour looking at various things. It was very interesting.
I prefer to do things on my own, but I would not have been comfortable driving up the roads to the summit. They are not very wide or well marked. I also would have missed all the commentary and the star gazing.
Spend the money... ask for Jim. You will have great tour.
If you own or manage Mauna Kea Summit Adventures, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.