Except for the last few 100m it's tarmac. All spectator access roads described by the organizer are easy to drive on. ;)
Also on the road towards spectator point 4, where you see the 23,55km mark on the map, there's a nice situation that's easy to reach (also tarmac road towards it I think). A fast left-right combination, the second corner is a little slower than the first, but still very fast.
http://www.rally-image.be/foto/0217/images/019.jpg