Visit Iceland on foot
Iceland has no railways but they do have excellent bus system, that can take you easily around. IOYO bus system can offer you flexible and independent travel, a great alternative to Europe's Interrail. Whether you want to travel in-land or around - this link is a good help to do so icelandonyourown.is
If you plan on spending most of your time aboard outside your cabin, and perhaps are traveling on a tight budget, the couchettes are a good choise to travel in. It's one of the easiest ways to cut costs is on transportation.