Despite having spent 12 month there in my early twenties and having travelled once around and to the centre, I always discover new and fascinating places.
My last journey has even been recorded in a blog which you can find here.
Incredibly fascinating but also slightly scary (nearly a dozen active volcanos). In less than a day it is possible to visit sandy beaches, moonlike landscapes, tablelands, gorges, waterfalls, glaciers and a lot of volcanoes. The whole story can be found here.