It looks like the comeback of big-ship cruising in North America is, finally, at hand. Two of the world’s biggest cruise lines, Royal Caribbean and Celebrity Cruises, on Friday announced they would resume North America cruises in June with sailings out of the Bahamas and St. Martin, respectively. Royal Caribbean — the world’s largest cruise line — said it would begin seven-night sailings out of Nassau in the Bahamas on June 12 that will feature calls in the Bahamas and Mexico. The trips will take place on the line’s 3,807-passenger Adventure of the Seas — a ship that originally was...