U.S. $570,000,000 CREDIT AGREEMENT, dated as of April 6, 2006 ROYAL CARIBBEAN CRUISES LTD., as the Borrower, and CITIGROUP GLOBAL MARKETS INC. BNP PARIBAS SECURITIES CORP. DNB NOR BANK ASA and NORDEA BANK NORGE ASA, GRAND CAYMAN BRANCH as Co-Lead...