Weekend camping and hiking trails in Tennessee?

Does anyone know of any good weekend long hiking trails in Tennessee? I'm from South Carolina and me and my fiance are looking to go hiking. I'm an avid camper and I like to camp primitive (tent and self brought supplies). I'm looking for something moderate in regards to difficulty, with good views and nice camping spots along rivers or wooded areas, that are fairly secluded. Any information would be great. Thanks! Paid or free, doesn't matter to me.