There are over 30 active volcanos in Guatemala and one of them is Volcan Pacaya. We took a sunset tour of it and can honestly say that it was one of the coolest things we have done on our trip so far.
The approach to the summit goes from a jungle setting to a landscape that seems like you're on the moon. Loose black volcanic rock (very sharp!) without a breath of life anywhere on it.
Our guide (who was an absolute madman) hauled our butts up to the summit in record time to show us the main event.....lava flowing everywhere! He then proceeded to leap frog from one 'cool' spot to the next to show us the way between the various lava flows and insisted that we follow him.
As you crossed over the various 'safe' fields, you felt the heat almost burning your legs from the vents. You also couldn't stand in one place for very long as your feet started to heat up through your shoes and there was a chance that your soles would melt! We both were thinking 'only in Guatemala are you allowed to go hang out on active lava fields like it's a walk in the park'. Absolute craziness but SO COOL!
After an adventure like that, we've decided we need a more mellow vibe and are heading back into the mountains to check out some flowers and coffee plantations.