Hired mountain bikes for the day and scooted off for a 30km loop among the lava fields. Best bit near the end with “the rollercoaster” between two of the hills. Great fun and quite challenging for me as I’m Trying to develop some off road competence. Gave myself a wee fright at the end misjudging something and clattered by ankle off the pedal. No real harm done, but swollen and bruised for a few days! It was finishing straight on the road after that.