Ky Quan San Peak, also known as Bach Moc Luong Tu, is a challenging but rewarding trekking destination in Vietnam, offering stunning views and diverse landscapes. Treks usually take 2-4 days to complete. It is crucial to hire a local guide due to the difficult terrain and potential for getting lost, especially for safety and navigation. Solo trekking is strongly discouraged. The best time to visit is during the dry season (September to May) to avoid slippery and dangerous trails. Costs vary depending on the tour operator, but expect to pay around $100-$200 for a guided trek including permits, porter and food. Accessibility can be difficult, requiring a drive to the starting point and the hike itself being strenuous and not suitable for individuals with mobility issues. Be aware of potential seasonal restrictions due to weather conditions.