Equestrian
Federation of Riding for the Disabled - http://www.frdi.net/
A global organization that forms worldwide links between countries, centres and individuals offering equine facilitated activities and assists in the development of new programmes worldwide.
Horse and Mule Trail Guide USA - http://www.horseandmuletrails.com/
Features a guide for all states, includes horse camp grounds, trails, overnight accommodations for horses, and commercial trail rides where you bring your own horse.