A visit to Iya Valley in the centre of Shikoku is a must for anyone wanting to get off the beaten track. You will need a car, a compass, nerves and time. Because you'll be stopping a lot to take pictures, letting other cars past and trying not to look over the cliffs to the left or right.
I recommend staying at Tougenkyo-Iya, a series of thatched roof cottages that are perched high upon a mountain. Self-catering, so make sure you bring some food! You will wake to a stunning view of the valley. The only problem with staying somewhere so beautiful and remote is that you won't want to get out and explore.
Find out more about Iya Valley.