Trouble in paradise: Cash-strapped tourists avoid Hawaii – USATODAY.com LAHAINA, Maui — Every winter, scores of humpback whales trade the Gulf of Alaska for a few months of breeding, birthing and basking in Hawaii — a follow-the-sun migration that fuels much of the tourism industry in this former 19th-century whaling town. But while the marine giants are returning right on schedule this year, their cash-strapped human admirers are not. And the effect of that absence is, “in a four-letter word, ugly,” says Bill Seidl, a boat captain who peddles whale-watch trips on the Lahaina waterfront. We seem to have fallen…