My husband and I had originally booked the Vestmann Island tour, but as you might expect when visiting Iceland in the winter, the weather had other ideas. When the ferry got cancelled the owner offered their great circle tour instead - and yet the weather wouldn't even let us do that, blowing vehicles off the road.
The owner instead picked us up at our hotel and gave us a six hour private tour of Reykjavik and the surrounding areas. Having driven taxi for 30 years in the capital area, Magnus not only knew where everything was, he knew stories about everything we passed. We saw much of the capital area and all the main sights, and even took a trip out to Bessastaðir, the official residence of the Icelandic President. He also paid our way into two museums.
While I was sad the weather conspired to keep us from Westmann, I couldn't have asked for a better tour of the capital area, or a better tour guide.