Costa Rica offers many natural attractions that make it a great vacation spot, including 300 beaches, 28 national parks, volcanoes like Arenal and Poas, cloud forests like Monteverde, and opportunities for wildlife viewing and adventure activities such as surfing, zip lining, and rafting. The document outlines 10 specific national parks and natural areas to visit and notes Costa Rica's biodiversity with over 300 bird species, as well as cultural attractions ranging from folk dancing to thermal baths.