Years ago, I coxed a crew which was interviewed for a student magazine, and we all had to put down our hobbies and ambitions. One bloke, with a wit unusual amongst occupants of the three seat, cited his hobby as "exploring the frontiers of pain", and his ambition, "to have a map next time".
Well, adventuring in the wilderness is all the rage these days, so if you're considering erging a marathon (and I've put the idea in your head now, so you can't not do it, [evil chuckle]), here's something like a map.