For a small island measuring just 16 miles long and 3 miles wide, Anguilla packs a big punch with luxury vacation seekers. Across the sea from St. Martin, the eel-shaped isle coveted for the lack of cruise ships, casinos and throngs of tourists is home to a seaside slew of high-brow resorts that attract a moneyed crowd who pay handsomely to unwind and indulge.  Formerly Viceroy Anguilla, Four Seasons Resort Anguilla upped the ante following a $10 million rebrand and upgrade investment.  The only resort on the island that fronts two beaches, the half a sandy mile it occupies is as perfect as the beach brochure photos that sell the island.