Geology Picture of the Week, June 7-13, 2009: Cauldron of Kilauea
http://www.freerepublic.com/focus/chat/2271310/posts
Been there too! In an open helicopter.
Outstanding!
Haleakala on Maui has an extensive optical telescope site at 10,000ft that must have gathered spectacular photos.
http://www.ifa.hawaii.edu/haleakalanew/observatories.shtml
Took the early morning helicopter ride in 1977... awesome panorama suddenly opened as we popped up through the clouds and cleared the rim.
Saw two 360° rainbows above and below the helicopter from the rotor wash in the cast off mist just after clearing the main cloud layer.