Adventure tourism is a big deal in Iceland. I spent a day exploring sparse volcano country in a rugged "Super Jeep" with our guide Arnar. While the weather was terrible, it was still a glorious day as we ventured up a long lava-flow valley in the shadow of "E15"--the famous volcano only Icelanders can call by name (Eyjafjallajökull). Foreigners are invited to refer to by its first letter and the number of letters that follow. With Arnar at the wheel, we climbed crumbly hills and eventually parked at the foot of a mighty glacier for a picnic.