7 Night Mediterranean Cruise on the Costa Serena from $482 on CruiseDirect.com. Book Today! More The new Costa Flagship will be the ship of space and light. Its name symbolises harmony and serenity. Costa Serena and her sister ship Costa Concordia, are the largest and longest ships in the fleet. The prestigious Samsara Spa spreads over two decks and will be a haven of wellness and relaxation. The beautiful Samsara Suites have direct access to the Spa. Over 500 cabins will have balconies. Choose from 13 Bars and 5 Restaurants. There are 4 swimming pools, two with retractable glass roofs. The decks are spacious and panoramic, and the stylish public areas are designed with your comfort and relaxation in mind.