I stayed at the Carolina Beach State Park Campground a few times and enjoyed every moment. First of all, it provides an affordable option for those who want to be close to the beach but also enjoy camping, woods, and hiking trails. It's also a nice campground with clean nice bathrooms and showers with hot water.
Sites 71 and 73 are connected and provide plenty of space for a larger group with several cars. The site doesn't have tent pads, it's basically just some gravel, pretty level and with a lot of space for tents.
The park has about 5 miles worth of trails. My favorite is the Flytrap trail, which leads to swampy areas with Venus flytraps and other carnivorous plants. They are small and easy to find if you know where to look. Ask a ranger for specifics.
BTW, if you're in Wilmington area, check out https://www.wilmingtonandbeaches.com/listing/stanley-rehder-carnivorous-plant-garden/901/ - this is a cure little destination for kids and adults.
The weather can be hot and humid during the summer months. Bring a lot of bug spray!!!