Curonian Spit National Park, a UNESCO World Heritage site, is a unique, narrow sand dune peninsula separating the Curonian Lagoon from the Baltic Sea. Accessibility varies depending on the specific area; some parts are easily accessible, while others require more physical exertion due to sandy terrain. It's suitable for both solo exploration and guided tours, with guided tours providing deeper insights into the park's ecology and history. Seasonal restrictions may apply, especially during breeding seasons for birds and other wildlife. The approximate cost involves park entrance fees and transportation, with a typical visit lasting from a few hours to a full day or more, depending on your interests. Be prepared for windy conditions and bring appropriate footwear for walking on sand.