One of the 25 wonders of the world, The Blue Lagoon lives up to its hype. The textured black volcanic rock lined with white calcification in contrast with the bright light blue water is stunning. Don't expect a quiet retreat however- this popular tourist spot draws from all over the globe, including boisterous, rolley-polley Americans representing our stereotype well. Regardless, put on your high-tech wristband, bath in the geothermal water with an algae mask and a green drink, and finish with a detoxing sauna.
Most airlines consider January the off-season and don't fly to Iceland then... appropriately, the staff prefer this month best: when there are less people, the sun sets at 5 over the water, and then the northern lights put on a show.