Four hours to kill in Reykjavík airport

However much I try to avoid asking strangers for directions, it's impossible to look lost in Iceland for more than 30 seconds before a stranger in a 4x4 or a van pulls up and asks where I'd like them to drive me. It's not actually as terrifying as it sounds. I found myself on the wrong side of Reykjavík airport, facing a walk of a few miles round to the entrance after already walking for half an hour from the hostel in the city centre. I was rescued by an Icelandic courier driver. 

After the standard 'Where are you from and what are you doing in Iceland?' conversation, I explained that I was travelling before going to university in October, to study biochemistry. 'I always hated chemistry!' he exclaimed. 'I'm a physicist. I had to take some classes in chemistry but there's something about Avogadro's number that I just hate!' I wondered to myself how anyone could hate Avogadro's number. After he'd told me about his difficulties choosing a project for his doctorate, his decision to leave academia and become a hiking guide and his career change to courier driver, we arrived at the airport. 

I've roughly halved the weight of my rucksack by offloading the now useless camping gear into a luggage locker. I need to catch two buses to get to Borgarnes - unfortunately, the next bus doesn't leave until 3pm, so I have four (well, three and a half now) hours to wait. Finding things to do in an airport is not usually a problem, but the Reykjavík domestic airport terminal is one room, which contains a check-in desk, a cafe and a baggage reclaim belt.