We did the Deluxe Volcano Experience offered by
Kailani Tours and cannot say enough good things about it. Visit the web site to see all they offer. Worth every penny!
Aside from that, I also recommend self-paced tours using the
Gypsy Guide app. On a previous trip to Oahu, we paid some big bucks for a Circle Island tour, on a huge bus, with 50 strangers (and some really strange people, too) at the tour guide's pace. With the app, we rented a car for a day, and paid $8 for the app, and away we went. We stopped where we wanted to stop, for as long as we wanted, skipped what we weren't interested in, and ate where we wanted to! We loved it so much, we got the version for Big Island and Kauai as well. We toured the Kona Coast, Punalu’u Black Sand Beach, and all sorts of hidden by-ways we'd never have found without the app. On another day, we toured the Kohala Coast, Hawi and Pololu Valley, and down through Hilo.
On the way back, we went up to the
visitor center on Mauna Kea for the stargazing presentation. That was utterly breathtaking. If you do this, be sure to bring warm clothing, as the temperature drops into the 40s after dark, with some really brisk winds.
Another app is the
Shaka Guide, that does the same thing, but only has a volcano tour for Big Island, which we had already done with Kailani Tours. It's excellent for Oahu and Kauai, and we plan to use both apps when we return to Hawaii next year with Maui on the itinerary.