Sea turtles of Costa Rica create one of the most remarkable nighttime wildlife experiences anywhere in the world, drawing visitors who want to witness nesting, arribadas, and hatchling events in their natural environment. The cover of darkness provides protection for mother turtles, allowing them to safely crawl ashore, dig a deep nest, lay dozens of eggs, and camouflage the site before returning to the water. Guided tours take travelers along protected beaches where conservation programs work to safeguard nesting habitats, monitor populations, and prevent poaching. In Ostional and Nancite, mass arribadas occur several times per year, bringing tens of thousands of olive ridley turtles ashore in synchronized cycles that last several days. Naturalist guides describe the reproductive cycle of each species—olive ridley, green, hawksbill, and leatherback—explaining migratory patterns, threats from climate change, and the importance of protecting coastal nesting sites. Many tours offer opportunities to observe hatchlings making their first dash to the ocean, a powerful moment that highlights the fragility of marine life. Visitors also learn about ecological relationships between turtles, predators, beach conditions, tides, and moonlight, all of which influence nesting success. Night tours operate with strict rules on red-light usage, group sizes, and viewing distances to ensure ethical wildlife interaction. Photography guidelines are followed to avoid disruption, while guides provide educational insight into marine conservation and coastal ecosystems. Witnessing sea turtles at night connects travelers to Costa Rica’s natural heritage and provides a deeply meaningful experience that stays with them long after the tour ends.