El Yeso Dam, nestled in the Andes Mountains, is a stunning turquoise reservoir and a popular day trip from Santiago. Accessibility can be challenging, involving a potentially rough drive on unpaved roads, so a 4x4 vehicle is recommended. While solo visits are possible for experienced drivers, guided tours offer a safer and more informative experience, especially regarding road conditions and local insights. The best time to visit is during the Chilean summer (November to March) when the weather is more predictable; winter months can bring heavy snowfall and road closures. Expect to spend around 6-8 hours for a round trip from Santiago, including travel and time at the dam. Costs vary depending on transportation, but generally include fuel or tour fees, and potential entrance fees to access certain areas around the dam. Remember to bring sunscreen, water, and warm layers, as the altitude can make it feel colder.