Not a campground, but right next to one!
Right off route 1 between Dewey Beach and Bethany, campgrounds line the inlet (connects the Atlantic Ocean to the bay in land of Bethany). Its a popular place to fish off the jetties and for public beach access. Because of this the surrounding bathroom facilities are well-kept. Lots of trailers stay here, but so do tents. The bridge across the inlet is beautiful and has a pedestrian path!