Organized tours, Volcano
If you are taking an organized tour, check out where exactly they will take you. My tour was very interesting, but unfortunately they did not go anywhere near where the Lava was flowing. Which would have been an Awesome site.
Fondest memory: Just everything about this place is a fond memory. You walk around and see some incredible things. Steam spurting out of vents, and gases, which you can smell. I had a really strange feeling while in the middle of all that.
To think the crater we were walking around in, could at any time just cave in. Especially now, since so much lava is flowing out into the ocean.