1) The document summarizes case studies of several cruise ships including their capacities, engines, propulsion systems, and estimated costs. 2) It also describes potential retrofit opportunities for improving energy efficiency aboard ships such as improving motor, pump and fan efficiency, improving electrical generation efficiency, and implementing waste heat recovery systems. 3) Key cost indicators for ship operations are provided including costs for various fuels, capital costs for engines and generators, and estimated costs for delivering electricity, producing potable water, and providing space cooling.