Reykjadalur is a delightful geothermal valley where there’s a bathable hot river – bring your swimsuit. There are maps at the tourist office to find the trail; from the trailhead car park, it’s a 3km hike through fields of sulphur-belching plains. Stick to marked paths, lest you melt your shoes, and leave no trash. In recent years the area has taken a beating due to thoughtless visitors.
