This thread should hopefully give you all the info on accessibility access for the parks.

http://www.buschgardens.com/BGT/pi_access.aspx

http://disneyworld.disney.go.com/wdw...=PlainHomePage

http://www.seaworld.com/assetrepo/do...ss%20guide.pdf

http://www.universalorlando.com/hour...formation.html