The Active.com Camping API, backed by Reserve America's database, provides access to campground data for 97% of the US and Canada's national and state/provincial parks. With it, developers can search for available campgrounds with horse sites in the state of California, for example. Or, developers can search for campgrounds in Maine that allow pets.
This API features two concepts, campground and campsite. Campgrounds are generally situated inside state or national parks and consist of one or more campsites. The Active.com Campgrounds API is a read-only API and returns registration links for campgrounds on ReserveAmerica.com which is public data. As a result, no security measures (SSL, Oauth) are required. The API uses RESTful calls and responses are formatted in XML.
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I am using it for windows phone7. But the campground details api is not giving details of federal and private campgrounds. :(