Here's lava flying out of the crater just before dawn. You have to photograph lava while the sky is still somewhat dark -- you can't see it in full light. The video is kinda shaky because we were on a boat.
During the day, you get nice billows of smoke. You can hear the boom of the explosion here. We could feel the vibrations and hear rocks and debris showering down on the mountain. At one point we got hit with some volcanic ash, which was a little nasty.
It was the coolest natural phenomenon I've ever seen. I'm still kind of giddy.