Haven’t done Cape Romaine but have birded quite a bit at Bear Island/Donnelley. A lot of the southeast specialties are easy at these places-Purple Gallinule, whistling duck, Least Bittern, spoonbill, etc- but the real draw is the shorebird migration, which is completely dependent on water levels in the impoundments. When the levels are low and a lot of mud flats are exposed, it can be quite the spectacle of shorebirds, wading birds, and terns. Unfortunately, it seems that such conditions are becoming increasingly infrequent. Also, at Bear, check the next boxes for Barn Owls!