Well, DW has no overall theme. There are themed areas of the park. Some are themed on east Tennessee, others the Southern Appalachian region, and a couple on Dolly Parton's life. Here's the info straight from DW: "Dollywood is organized into ten themed areas. The Showstreet, Rivertown Junction, Craftsmen's Valley, Village, Country Fair, Timber Canyon, and Jukebox Junction areas reflect the historical eras and culture of east Tennessee, while the Dreamland Forest and Adventures in Imagination areas explore Dolly Parton's life and imagination. Many attractions at Dollywood preserve the history and culture of the Southern Appalachian region."
FYI: Adventure Mountain is part of the new (established in 2008) Wilderness Pass area, which connects Timber Canyon and Craftsmen's Valley. This area also includes the new River Battle and the SkyZip attraction.