hi,
You can do a circuit starting on the a11 next to the services, across the A11 which is part of peddars way, over the crossing to croxfield Heath, on tsrmack go Hereward way (also known as track 23 the doggers track....) then a big more road into Mundford then there are some good tracks out towards weeping.
If you have memory map or view ranger I have some gpx files....
Cheers
Darren