Parque Nacional Guanacaste offers an immersive experience into Costa Rica's dry tropical forest. While generally accessible, a 4x4 vehicle is often recommended, especially during the rainy season (May-November) when roads can be challenging. Visitors can explore independently, but hiring a local guide is highly advised to enhance wildlife spotting and ecological understanding. Expect entrance fees around $10-15 USD for non-residents, with guide services costing extra. A typical visit can range from a half-day (3-4 hours) for a hike to a full day, or even longer if staying at one of its biological stations. This UNESCO World Heritage site, bordering Rincón de la Vieja, is less frequented, providing a more rugged and pristine encounter with diverse flora and fauna, making it ideal for nature enthusiasts and birdwatchers. Remember to pack essentials like water, bug spray, and sturdy footwear due to limited on-site facilities.