If you have the Interagency Senior Pass or Access Pass (available at any National Park) you can try any of the Louisiana State Parks as a camping destination. They're open year-round, and the Interagency passes get you half-price on camping, usually $9~$10 per night vs. the regular $18~$20. Grand Isle State Park is on a barrier island, right next to the beach. There are two state parks within the New Orleans metro area (St. Bernard; Bayou Segnette), three right on the north shore of Lake Pontchartrain (Tickfaw, Fairview-Riverside, Fountainbleu). Though slightly farther away, Bogue Chitto State Park is my favorite, so far. If memory serves, all have water and electric, some may have sewer hookups as well (Bogue Chitto does, for sure, at its upland site).
Although they don't honor the Interagency passes, Mississippi has a state park (Buccanneer State Park, Waveland, MS) not too far from the gulf coast casinos, that is also within easy range of New Orleans.
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