This may be to far from Wilmington for you, but we just got back from James Island campground, outside of charleston. LOVED IT. Every site has shade and privacy, well almost every site. 15min drive to folly beach. They give you free parking at folly beach park. Check it out online if your interested. Tons of things to do in the park for kids. MILES of paved walking/biking trails, fishing/crabbing, fresh and brackish, HUGE climbing wall, water park, spray ground, best playground I've seen at a county campground. We were looking in NC but I don't care for crowds and I like my shade and couldn't find in NC to accommodate my qwerks.
2005 Dodge Ram 5.7
2014 Sunset Trail 300BH