The National Park Service has just launched a website to assist people with disabilities at national parks.  The site is called "National Parks:  Accessible to Everyone" and can be viewed at:  http://www.nps.gov/pub_aff/access/ .  From their website:  "from Padre Island National Seashore in Texas to Isle Royale in Michigan, and from Coronado National Monument in Arizona to Fort Union Trading Post in North Dakota – all visitors deserve the privilege of experiencing the significance of these and any of the other 391 units of the National Park Service."