From opposite the pits, just walk past the wheel and bungee nutters, and keep going. You end up inside MB campsite. IIRC they checked our tickets. I bloody hope so, as I had a tent etc in there.
As for 'unusual' spots. If you see a guy lying down at the start of the pit straight, it's only me. GREAT photo spot.
Off the Ferris Wheel
Inside of the course, at Foret S. It's a STEEP climb, mind the razor wire that's around the place... Would I have liked to be here for McNish's shunt? No, thanks. TOO scary for a while. The tyre marks are visible top left.
There are loads more... Use your eyes, and brain. You'll find ones I don't know about!