This weekend I joined a trekking expedition from Skógar to Þórsmörk. The 25km hiking trail from Skógar, over the Fimmvörðuháls pass between the Eyjafjallajökull and Mýrdalsjökull ice caps, then down the other side to Þórsmörk, offers spectacular views and traverses lava from the 2010 eruption at Eyjafjallajökull (description source).
The trek was organized by Útivist, one of Iceland’s two major outdoor associations. There were only 5 people in our group and we had a good group dynamic. On the first day we saw a total of 32 waterfalls, hiking up to Fimmvörðuháls pass. On the second day our route took us over glaciers, a volcano mountain (still warm from the eruption) and some other sights as we’ve descended into the beautiful valley Þórsmörk, where we’ve slept the second night. The hike itself isn’t too hard and most people should be able to do it in two days. The weather and other conditions were perfect, sunny and nearly windless. I’ve been told that this type of weather here occurs maybe once or twice per year. It was a great hike and I recommend doing it if you are ever in the area and enjoy this type of activities.