Originally Posted by catcher1

There are interesting day trips in Reykjavik, including an excellent one to a volcano, another to boiling springs. Sightseeing in the city is also nice, and the Blue Lagoon deserves a visit despite naysayers' claim it's a tourist trap. And after all, when you return home the first question you'll be asked is whether you went there.

But three days would be plenty. Hop over to London! Three hours by plane, and reasonable air fares.