Descend into the magma chamber of the Thrihnukagigur volcano. Transport provided from the city for the 30 minute drive to the starting point, or you can drive yourself.
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Operated by a small group of friends and family, Islenski Hesturinn offers excellent service and tours with hotel pickup. Riders of all skills are welcome and matched to horses of their ability and personality, and various tours are available through Icelandic lava fields.
A brand new complex on the outskirts of the city, it has nice views over the city centre and is a nice place to watch the sunset. There is an indoor and outdoor pool, a waterslide, several hot-pots and a steam bath. This is a favourite with families and is perhaps the nicest of the city's pools. Buses run here from central Reykjavik.
Árbæjarsafn
In the suburb of Árbær, and frequently called Árbæjarsafn (Árbær museum), this open air museum contains both the old farm of Árbær and many buildings from central Reykjavík that were moved there to make way for construction. The result is a village of old buildings where the staff take you through the story of a city. The staff are dressed in old Icelandic clothing styles and trained in various traditional techniques, for example in making dairy products or preparing wool.
Hellisheiðavirkjun
Get a tour of the geothermal power plant that provides Reykjavik with heating and hot water.
Borgarleikhúsið
Like the national theatre, the city theatre puts on a mix of new Icelandic plays and highlights of international theatre.
Here you can swim in the Atlantic, because they pipe hot water into the ocean. A beach of golden sand has been created and a “pool” has been enclosed nearby, where the water temperature is about 20°C. There are several hot-pots. Refreshments and various services are available at the beach.