This design report presents the outcomes of a multidisciplinary project undertaken by a team with diverse backgrounds in civil engineering. The project focuses on a preliminary design for a new marina in San Antonio Este, Argentina, with the purpose of serving as a recreational spot and a terminal for a nautical connection to San Antonio Oeste. Recreational activities include whale watching and swimming with sea lions. Sustainability is a key guiding principle, aiming to blend the marina with the natural environment and add value to the region. The report starts with an introduction outlining the project’s background, goals, and scope, followed by a detailed methodology for the design process. The area study section highlights the environmental and hydrometeorological conditions of the project location, emphasizing the challenges posed by a significant tidal range. It also discusses the choice of a water bus stop location in San Antonio Oeste and provides recommendations for further data collection and development. The design stage presents the chosen preliminary design, detailing the pier, floating pontoon, gangway, mooring field, and boat ramp. Finally, the need is noted for more precise data, environmental assessments, and geotechnical investigations to improve the design.