Barbados is one of the better-equipped destinations in the eastern Caribbean for travelers with disabilities, though it still has some way to go.
Many areas still have uneven sidewalks, or don't have any at all. Furthermore, public transport is generally not conditioned for wheelchair access.
The excellent Barbados Council for the Disabled (http://barbadosdisabled.org.bb) is working with local businesses to make them accessible through the 'Fully Accessible Barbados' program. They provide a number of services to travelers, including beach wheelchairs, accessible transportation and travel-planning assistance.