Pontchartrain Beach. I rode almost every ride in the 70's. If you attempt to go to this lake today you would be arrested.
The beach has been, for some time considered toxic.
Lake Pontchartrain is situated between the Mississippi River and the Gulf of Mexico; hence it's a cesspool. All toxins dumped into the Mississippi, from Canada down - land in this lake. The river pushes the toxic waste down, and the ocean pushes back.