We spent a week at the Oak Plantation Campground just outside of Charleston, SC. It was a nice campground with good level sites that weren't too close together. We were there in mid-May and it wasn't very crowded. Weather in May was pretty warm already though, but there are a lot of fountains along the waterfront in town and you'll see a picture of me splashing around in one to cool off below.
Here's Dick about to enjoy his birthday lunch at Magnolia's: