I was staying at Hotel Cabin in Reykjavik, just a short trip outside of Reykjavik there is the Blue Lagoon in Grindavik. The geothermal spa offers the most relaxing and natural bathing, I havent been that relaxed in so long. The minerals from the water are great for your health and skin. The water that comes from an underground hot spring reach 37-39 degrees celsius. It is very blue and picturesque. Being in this hot spring during sunset was one of the most relaxing experiences I think anyone can have, I know its at the top of my list!