I read some of the other Iceland threads here and remember some of the key words like Blue Lagoon and Golden Circle. The trouble is, those threads were created for a summer itinerary whereas I will be traveling in fall/winter. I looked into a stop-over in Reykjavik on my way back from Amsterdam and it seems that the ticket isn't more expensive whether I do one day or two (or even three), so what are my best options to explore Iceland in the best way on a grad student budget for a couple of pretty cold days?