I just had 3 days leave - spent it in the Yorkshire Dales, running 27, 37 and 26 mile respectively. I didn't book accomodation just stayed at pubs wherever I got to. Lovely sunny days Tuesday & Wednesday, snowed yesterday!
I'm with Ian on recce's - if you get to a poorly marked boggy section in the dark no amount of recces is going to help! Beyond CP3 Middleton (where I withdrew last year), I'd seen none of the course and not sure it would have helped that much if I had. It was actually really nice to see fresh sights for the first time
The Cheviots - well it's 28 miles essentially following a fence/wall most of the time!
More important to train in appropriate terrain - lots of hills etc