Headed to TN and SC in March...

So we're planning a vacation in March to Gatlinburg, TN, and Charleston, SC. I was wondering if anybody has recommendations on what we should do or see while we are there. In Gatlinburg, we're gonna check out the whole Ripley's setup, and we're going to Patriot's Point in Charleston. Other than that, I'm open to suggestions. Oh, I should probably tell you our group consists of two adults, one senior, and a 7 year old boy. Thanks in advance!