The geothermal park Hverasvæðið, in the centre of town, has mudpots and steaming pools where visitors can dip their feet (but no more). You can book ahead for a guided walk to learn about the area’s unique geology and greenhouse power. Or they'll give you an egg and apparatus (Ikr100) for boiling it in the steaming vents. There's a small cafe with geothermally baked bread.