I have been there in the summer during the long days and the winter. I loved both seasons as they bring their own attractions with them. I have seen the Northern Lights, I swam in the Blue Lagoon, rode Icelandic horses, seen the black sandy beaches in the south, partied here, made new friends and tasted many of the Icelandic specialties.
I highly recommend a visit, a visit to the place North of the Wall.