if you are travelling from the EU/EEC your passport must be valid for at least 3 months after the date of your departure.
If you are travelling from outside the EU/EEC the passport must be valid for more then 6 months after your departure.
Don´t know how to get from Keflavík airport to Reykjavik? Do you prefer a taxi or the Fly- bus. You can stop at the Blue Lagoon on your way to Reykjavik. I information on prices and how to book the Fly-bus or a taxi to Reykjavik here: Book Airport transport.
A few things to do and see while in Reykjavik, selection of art galleries and links to all the shopping malls. For more information see Reykjavik, Iceland
The tap water in Iceland is safe to drink and extremely good. Iceland is one of the countries with the cleanest water in the world.
You can even drink water straight from all the rivers (not glacial rivers).
Don´t buy bottled water, fill you water flasks from the tab or from the many small rivers all around Iceland.
When traveling around Iceland it is essential to be prepared. Take a look at this site be for you start your trip: safetravel.is.