Just did the drive to the top of MK with a Jeep and I totally agree that there was absolutely no need for a Jeep to get up there. In fact, going up on the unpaved portion I experienced lots of fishtailing because of the low traction and would have probably been better off in 2WD mode.
Other than that, we came to see the volcano. Sadly, there was no lava entering the ocean occurring and also high SO2 conditions limiting access to much of the park. But it was a true highlight to stay in the Volcano House. If you can afford to spend the exorbitant rack rate of $330 per night to get a crater facing room, do it. Watching the glowing crater is mesmerizing (in the same way watching a fish tank is) and to be able to watch it lying in your hotel bed is uniquely fantastic.
Kona coffee is not that fantastic. I've bought better from French Press (in Lakewood) and from Gevalia's Limited Editions at lower prices.