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http://www.nps.gov/hale/
It's awesome. We rented a car and drove to the top of this volcano. Beautiful views and a cool experience driving above the cloud layers. You literally drive through a cloud and pop out above them. Pretty surreal to be looking down on the clouds as you are driving.
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We did the same thing. It's an awesome view. The only thing I recommend doing is wearing warm clothes and bringing a jacket. I wore shorts and a t-shirt and nearly froze to death at the top. It was 90 degrees at the bottom of the mountain and about 50 degrees at the top.
Also, the Hana highway is a must-drive.
Both of these things are on Maui.