Did a couple of times there on company trips. Yes, the volcanoes is the top of the list for sure. That said, also did a boat ride to the spot where Captain Cook demise occured and snorkeled. Good deep sea fishing. Did some great hikes for the east side with all the waterfalls as well as the southernmost point of the US which was not long, but a certainly with some challenge to the green sand beach. The black sand beach with all the sea turtles was very cool. Did a helicopter ride with Blue Hawaiian- the one everybody said to use- and they were awesome.

And the coffee.... the wonderful coffee.