Captain Cook, United States offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Captain Cook is known for the Captain Cook Monument and the Kealakekua Bay State Historical Park. The best time to travel to Captain Cook, United States, is from November to April, with average air temperatures around 75°F (24°C) and water temperatures near 77°F (25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!