Transform your catamaran into a magical space to celebrate your birthday with decorations that will surprise your guests. Opt for a nautical theme that includes elements such as shells, fishing nets, and lighthouses, creating an enchanting nautical atmosphere. Add fairy lights and paper garlands in shades of blue and white to simulate the sea breeze and add a festive touch. Don't forget to include a small corner with cushions and blankets where your guests can relax and enjoy the ocean view.

For the main table, use a tablecloth on a light background and center the decoration with a beautiful bouquet of tropical flowers. Each guest can receive a personalized gift, such as shell bracelets or a mini lighthouse, that will remind them of the celebration. Additionally, a photocall decorated with a seascape and fun props can be the perfect place to capture those special moments at the party. Remember that live music or a playlist of your favorites will add to the festive atmosphere, making your birthday on the catamaran an unforgettable experience.