"This," said Mayor Frank Nelson of Panama City (pop. 26,000), Fla., "will be a city of destiny." Mayor Nelson's grandiloquence was inspired by a civic project that is fast becoming as necessary as neon lights for any ocean, lake or riverside U.S. town with vacation-spot ambitions: a first-class marina to serve as a combination club, garage and general store for the nation's ever-increasing yachtsmen. Last week Panama City was about to start work on not one but two big marinas with dock space for 570 boats along its Gulf Coast waterfront and...

