Right now? Try docks, piers, bridges, channels, mouth of creek, near shore and off shore AR's, live bottoms, low relief ledges. You will not have a problem finding a flat fish this time of year.
Flounder bite is HOT right now and has been for 2 months.
Radio island and fort macon rock jetties will have them hanging out to. Careful not to get to close to the guys fishing on the bank at macon. There is plenty of submerged jetty to fish. Good luck and post up a report!