The iconic and highly-visited geothermal spa just 12 miles from the Keflavik airport. It’s called the “Blue” Lagoon because of the water’s milky blue shade, which is due to its high silica content. The silica forms soft white mud found on the bottom of the lake lava rocks around it. The water is a comfortable 99–102 °F.

We bought the Comfort Package (the least expensive one), which included entrance to the lagoon, a silica mud mask, a towel, and a free drink of our choice. For our date and time slot that was $104 per person.