Cross Country running was something I loved at school - it was a personal challenge, felt more strategic and I was better suited to longer distances.
I also liked the way you didn't feel it was competitive so much as you were spread out and running alone some of the time. Great for the personal well-being.
The last time I ran properly was only a 10k run and although the run itself was on fairly easy terrain, I did most of my training for it over more challenging terrain - when I finished the run I felt like I'd ran well, saved plenty of juice for a good sprint finish and felt I could carry on for another 10k.
I'd love to get back into it, but I don't run so much now because other sports take my time up.