Enjoy a dip in one of the three small natural pools that make up Hrunalaug, which is just about 28 minutes from either Geysir hot spring or Gullfoss waterfall. Combined, about 10 people can be in the pools, so get there early if you want to beat the crowds.
There is a small hut where you can change your clothes but there are no showers or bathroom facilities. There is a small fee that you pay in a box nearby the pools.