HEllo,
Angie said "Anybody want to give me a place I could hook him up with to help 
plan maybe a trail system through the area that could stay open as it 
develops?  What about liability on the trail?  Does it become a public right 
of way?  If so, can they still keep tresspassers from outside off"
Here is a couple of ideas:
Equestrian Land Conservation Resource  (ELCR)
http://www.elcr.org/
They have lots of information and publications for these type of issues.
Here is another article I found on the web:
Land Use and Zoning Issues Affecting the Horse Industry
http://www.horse-science.com/landuse.htm
The Chronicle of the Horse once published an article
"10 Steps All Horse Owners Can Take to PReserve Land and Wildlife"
20 Sept 1996.  I looked on their website archives, you can order the back 
issue, but not read it or print it from the website.
ELCR is a good place to start though.
Good luck!
Happy Trails,
Maureen
Reno, NV
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