I should point out that, although Lanai was formed millions of years ago by a volcano, there aren't actually any active volcanoes on that island. The only active ones are on the Big Island (also known as Hawaii).
There's always someone coming in with facts that ruins the wonderful ideas. I'm going to pretend it is an active volcano and Larry Ellison is actually Hank Scorpio.
http://en.wikipedia.org/wiki/Evolution_of_Hawaiian_volcanoes