The Rio Celeste Waterfall Viewpoint, nestled within Tenorio Volcano National Park, Costa Rica, is a captivating natural wonder renowned for its vibrant blue waters. Accessibility involves a moderate 2-4 hour hike on trails that can be muddy and slippery, requiring sturdy, waterproof hiking shoes; thus, it may not be suitable for individuals with significant mobility limitations. While independent visits are feasible with a park entrance fee of approximately $12-15 USD, guided tours are highly recommended for enhanced context, safer navigation, and convenient transport, especially given the challenging terrain. Seasonal restrictions are crucial: the dry season (December-April) offers the best chance to witness the brilliant blue, as heavy rains during the wet season (May-November) can cause the river to appear murky. Typical visit duration ranges from 2 to 4 hours to comfortably hike to the falls and back. A vital insight is that swimming is strictly prohibited at the waterfall and within the park boundaries to protect the environment. Visitors should also bring insect repellent, ample water, and rain gear, as tropical weather can change rapidly.