Fire & Ice: Touring an Active Volcano

The Eyjafjallajokull volcano has been erupting since last month in Iceland and has led to an increase in tourism.  Many tour operators are taking advantage of this rare contrast of fire and ice and selling package tours from Reykjavik (by land and air) to the volcano.  For example, Extreme Iceland Travel Agency offers a "Volcano Up Close" which provides snowmobiles and gear for you to get up close to the action ($370 Euros). How awesome would it feel to be in one of these planes?!