Miraculously, he managed to avoid getting a ticket (but he did accidentally lock himself out of the car...Doh!). We thanked him for the tour (it's still one of the nicest things a stranger has ever done for me - so Smari, if you read this, thanks again!) and then told him that we were thinking about checking out the Blue Lagoon on the way back to catch our flight but that the lady at the rental car place had seemed underwhelmed when we asked her about it. Smari told us "Fuck that lady. If there's only one thing you could see in Iceland, it should be the Blue Lagoon. Don't miss it. Go there now." That settled it. We bid Smari farewell, and headed for Grindavik.