Man, they're gone.
Allright, apparently I'm the only one who gets excited about liquid hot magma. Actually, that's not true...

My closing thought on lava is best summarized in cooperation with the photo above and the delicate words of Jack Handey:
"If you ever drop your keys into a river of molten lava, let'em go, because, man, they're gone."
P.S. How cool would it be to throw stuff into that 100' by 65' pond of molten lava? Here's a short list of stuff that would be fun to throw in: a couch, a shoe, an acoustic guitar (a crappy one, of course), a bike, a window, bread, a boat... basically anything that can float on lava for a few seconds and disappear. It would be fun to push a car into it as well.