Iceland has always been proud of its eruptions
So we have even made stamps to remind us of noteworthy eruptions such as the Eyjafjallajökull eruption in 1947. It would have caused similar disruption to air traffic in our hemisphere as they Eyjafjallajökull eruption did if jets were ruling the skys at the time.
Hekla has been forgotten a little bit with the recent Eyjafjallajökull eruption. But Hekla is nonetheless the most active volcano in Iceland. For the past few decades it has erupted every ten years, 1970, 1980, 2000 and 20??
Historical eruptions in Hekla were at least in the years: 2000-1991-1980-1970-1947-1845-1766-1693-1636-1597-1510-1434-1389-1341-1300-1222-1206-1158-1104.
Hekla is very only a couple of hours drive from Reykjavík and you can hike to the top. Just be aware of your escape routes if it awakes from its sleep.