On your final day in Newport Beach, immerse yourself in the natural beauty and wildlife of the area. Start by visiting the Upper Newport Bay Nature Preserve, a stunning coastal wetland that is home to a variety of bird species. Take a leisurely hike or bike ride along the scenic trails and enjoy the peaceful surroundings. If you're interested in marine life, head to the Newport Harbor Nautical Museum, where you can learn about the rich maritime history of the area. End your trip with a relaxing harbor cruise, where you can spot dolphins, sea lions, and other marine creatures in their natural habitat. Newport Beach offers a perfect blend of beachside relaxation and outdoor adventure, making it an ideal destination for a 3-day getaway.