Be sure to check out Randall Feare’s AccessibleNatureTravel website. He covers a lot of ground.
Category: Resources
Good Article
This excellent article by San Francisco Bay area Bonnie Lewkowicz : Opening the Door to Nature for People with Disabilities was written in 2006, but is still relevant.
ADA guidelines
Lots of links for how to make an area/trail ADA compliant on the American Trails website: AmericanTrails.org