When in Iceland I recommend renting a vehicle. It’s a round island with a single ring road.
When renting a vehicle I recommend a 4×4. There are no trees, so you can drive anywhere.
When renting a 4×4 I recommend renting a Land Rover. The British were an adventurous lot.
When renting a Land Rover, get a Defender. It protected the King of England well enough now didn’t it.
When renting a Defender, get a Super with the armor. Iceland is icy.
When getting a Super, get a modified Super. You’ll want the snorkel, compressor, and 38″ tires.
Use ISAK 4×4 Rental.
A video and my travel map for Iceland: Iceland Map