My husband and I traveled around the periphery of Iceland (on Ring Road) over a 9-day trip this summer. In northern Iceland, Lake Myvatn area is an area of active volcanism and geophysical activity. The lake was created by a large lava eruption a few thousand years ago, and the surrounding landscape is dominated by volcanic landforms. The Hverfjall crater very close to the lake is one such formation that stands out. You can hike to the rim of the crater via marked trails. There's plenty to do in the area.