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=== Tours ===

http://www.tour.is/tours/activity_tours.php includes a number of tours, including year-round snorkling and horseback riding.

<blockquote>
If you would like to see Iceland underwater, this tour is for you! You will have the opportunity to snorkel in Silfra, one of the world’s top ten diving sites situated in the National Park Þingvellir.<br />
Silfra is a crack/fissure in the earth between the Eurasian plate and the American plate, which are drifting apart about 4-6 cm every year.<br />
The water in Silfra is ascends from the lava after being filtered for years underground from the highlands glaciers. You are able to swim out the crack without effort because of a light current that pushes you. 
</blockquote>

http://grapevine.is/listings/calendar?type=calendar&date=2.1.2009%2000:00:00 - a calender of Iceland events, including tours in January.

http://www.re.is/DayTours/Allourtours/

http://adventures.is/Iceland/Hiking/