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If you are not that commited to NC , at certain times of the year, you can ride on Myrtle Beach SC and you can ride on Amelia Island Florida year round. you cant camp on the beach at either location, but at Amelia Island, you can camp close enough that it is just a short ride to the beach.
there is a campground in Maryland, where i stayed last year that is right on the beach. It is a former military base and the cannons and underground bunkers are still there. If you wanted to go down toward Marianna florida, just south of the city are several beaches that allow camping and riding.
all of these are a days drive from Nashville.
sorry I couldnt help you with a beach ride in North Carolina. there is an old west town, called Love Valley near Statesville with several miles of trails. it is very unique.