Cold water to a Canadian is quite different to cold water for a Louisianan!
Years ago I would tent camp at Grand Isle State Park. 49 sites with hookups for less than $30/night. It's a barrier island. There is a great shallow water bay inside the state park where I would wade and catch blue crabs with dip net. I haven't been since Katrina or any of the other hurricanes of the last couple decades but hope to go back this summer.
When I camped there in '92, there was a family that had biked and camped from the Canadian border to Grand Isle State park, chosen because it was at the end of Hwy 1 on the gulf.
2008 Rockwood Signature Ultralite 5th Wheel
F-250 6.2 Gasser
Former PUP camper (Rockwood Popup Freedom 1980)