Set on the northern slopes of Rincón de la Vieja National Park in Guanacaste Province, Costa Rica, the One Day Nature Pass is a compact, well-paced introduction to volcanic wilderness. Beginning at the Hacienda Guachipelin Adventure Center near Hotel Hacienda Guachipelín, this five-hour program threads a hike on Las Pailas Trail with a lookout visit, a transfer to Oropendola waterfall, and a soak in the Río Negro hot springs and volcanic mud baths, finishing with a buffet lunch at the hotel restaurant. Las Pailas Trail is the day’s anchor: a network of boardwalks and dirt track that navigates steaming fumaroles, mineral-stained terraces, and abrupt basalt outcrops where sulfurous steam vents scent the air. The geology feels immediate — you can see weathered lava flows, tufa-like deposits and small vents that huff and bubble after rain. A short vehicle ride brings you to Oropendola waterfall, a broad curtain that plunges into a shaded pool framed by heliconia and tall guanacaste trees, a great spot to cool off and listen for the high‑pitched calls of forest birds. After active exploration the Río Negro hot springs and volcanic mud baths offer deliberate contrast: warm river pools edged by tufa formations where you can sink silty mud on your skin and drift in naturally heated seams. The hot springs here have a raw, elemental quality; they are less developed than resort spas yet managed by the hotel so guests have clean facilities and a shaded changing area. Guides who speak English and Spanish circulate on the day pass, pointing out endemic plants, insect life, and the occasional white-faced capuchin or howler monkey that cross the canopy. The One Day Nature Pass suits travelers with a morning or afternoon to spare who want a concentrated taste of Guanacaste outdoors without an overnight commitment. The route is family-friendly—children four and older are welcome—and groups are kept small with up to 15 guests, which keeps the pace personal and the trail less crowded. Practical notes: present the credit card used to book and matching photo ID at check-in, dress in quick-drying layers, bring insect repellent and sturdy shoes, and be aware that pregnant women cannot join for safety reasons. Whether you’re chasing waterfalls, studying steam vents, or simply soaking in a volcanic river, this day pass stitches Costa Rica’s volcanic energy and tropical biodiversity into an accessible, memorable outing. Bookable through the resort’s FareHarbor page, the pass is run with bilingual guides, clear timing, and a satisfying lunch that lets you linger on the terrace after a day in the park. For travelers based in Liberia, it’s an efficient escape into Rincón de la Vieja’s striking volcanic landscapes and easy wildlife encounters without complicated logistics and lasting memories.