Those who are fully vaccinated can now visit Iceland without needing to quarantine.
Before, only fully vaccinated citizens from EU/EEA countries could visit Iceland. But from 18 March 2021, the Icelandic government is allowing travellers from around the world to enter Iceland, such as the USA.
You'll need to present a full international vaccination certificate and take 1 PCR test for Covid-19 upon arrival in Iceland. You should receive your result within 6-12 hours, and if it is negative, you can continue on your tour of Iceland.
If you are not fully vaccinated, you can still enter Iceland but you will be subject to Covid-19 border measures. This includes presenting a certificate of a negative PCR test prior to boarding a flight or ship to Iceland. The result must have been collected no more than 72 hours before departure.
You’d then need to take 2 PCR tests for Covid-19 upon arrival in Iceland, with 5-6 days of quarantine in between each test.