Respect road safety
I know, I know - 'all right, MUM!' I hear you cry. But though it may be boring, it's true. Iceland's roads, although the vast majority is in excellent condition, can be very dangerous when coupled with the country's notoriously changeable weather conditions. So if you're renting a car in winter, make sure you get a 4x4 if possible, with studded tyres. And don't drive like an idiot in the snow.