We cycled down the hill of Öskjuhlíð on lovely bike trails from Perlan to get to Nauthólsvik - a geothermal beach that opened in 2001 and is now visited by over half a million guests each year. It was wonderfully empty when we visited, thanks to COVID 19.
We had a picnic on the beach during which the kids got a bit cold, so I hesitated to get their swimming gear out. I'm glad I did. They quickly warmed up in the hot tub and then ran happily down the beach and threw themselves into the lagoon. Sea temperatures in Iceland are bracing all year round but the lagoon is warmed to a fairly cozy 15 - 19° C during summer opening hours. There were quite a few Icelanders swimming in the sea... but we are working up to that. The changing facilities and showers were really clean and the whole place is just such an absolute pleasure that it's hard to believe that it's FREE! (Free during the summer. There is a small fee off season.)
The beach opens on May 15, and closes again on August 15 but the service centre and facilities are open for a limited time most days during the off-season.
You can rent towels and swim-suits at the service centre and you can buy snacks at Strandkaffi.
Web: https://nautholsvik.is/ Opening Hours: