Facebook has a group of exactly that: 
VW Westie Driveway Group

Check also these websites:
Camp In My Garden
Boondockers Welcome
Freecampsites.net
Allstays

Best wishes,

Geneva Saint-Amour
www.slowcarfasthouse.com

> P.S.  I would think that a registry of vanagon-friendly overnight parking places across the globe would be a lovely resource.