Blue Lagoon
Restaurant @ Treasure Island Resort & Casino
An absolute must. If you already travel so far to Iceland. Go. Book in advance online. Book a massage it's something different to float in the sun on water. Have a drink at the bar. Put some silica on your face as treatment. Wade through the steam of the lagoon. Shower. And enjoy a late afternoon lunch or dinner at the restaurant. Actually a really good place. To top it off.