The Xiji嶼 Blue Cave (North Shore Sea Erosion Cave) in Magong, Taiwan, is a stunning natural sea cave known for its beautiful blue light effect inside. Access to the cave is primarily by boat, making it less accessible to those with mobility issues. Guided boat tours are highly recommended due to the potentially rough sea conditions and the need for local knowledge to navigate safely. The best time to visit is during the calmer months, typically from late spring to early autumn, as sea conditions can be unpredictable during typhoon season. A typical boat tour to the Blue Cave usually lasts for a few hours and may cost approximately $50-$100 USD depending on the tour operator and duration. Solo visits are strongly discouraged due to safety concerns.