IN an effort to capitalize on the megadollars that megayachts can bring to a harbor area, coastal resorts around the globe are racing to build or retrofit their marinas to accommodate the colossal cruisers. [. . .] . . . new marinas . . . are being developed . . . To keep megayacht owners busy - not to mention spending - while their boats are parked at the marina, developers are surrounding their ports with high-end restaurants and retail shops. To entice yacht owners and their entourages to stay longer, they are also building luxury condominiums and five-star hotels....