Renting a car/shuttle bus
Where to sleep
It is said to be a must try in Reykjavik, but I was not impressed, far better (comparatively) the 0.50 cent IKEA hot dogs
It's a good place to have coffee, offering a nice spot for people watching (I love doing this :) )
Food has very strong personality and I don't think there is a in-between. You either like it or not.