Iceland’s Natural Beauty Cruise - In Akureyri, The Diamond Circle excursion is listed as a full day and a demanding excursion. From the description, it seems more moderate? If you have done this excursion, did you find it demanding? And, if demanding, what made it demanding — length of walking or difficult terrain or ..? Trying to decide between Diamond Circle (preferred) and Northern Iceland’s Natural Treasures, another full day excursion but listed as moderate.