Park at Hackpen Carpark or Barbury Castle
Walk the Ridgeway towards Avebury
Drop into Avebury
West Kennett Avenue
Silbury
Back towards The Sanctury
Back along the Ridgeway
Cross Fyfield Down Check out the Greyweathers, Long Tom.
Headback along the path to Barbury Castle.

Bit of a march , it can be done.

Better on a Mountain Bike :-)

Some pix here: http://www.mountainbike.jediknights.co.uk/Marlbouroughdowns_Oct_2003/index1.htm

Regs,

Ike