The geothermal area of Reykjanes is home to the largest hot tub in Iceland, just outside Hotel Reykjanes. but all that geothermal energy also powers Saltverk -- a local salt production company that uses a 17th century method of producing sea salt! Since geothermal energy is the sole energy source used, during the whole process they leave zero carbon footprint on the environment. Stop by for a tour, sample some salt, lunch at Reykjanes Hotel and take a soak in the pool!
After relaxing in the hot water, you will find a restaurant in the hotel nearby if you are hungry.