The Gibraltar Nature Reserve, encompassing the Upper Rock, is a must-visit destination accessible via cable car, local taxi/mini-bus tours, or on foot for the more adventurous, though significant parts involve steep inclines and stairs; mini-bus tours offer the best accessibility for those with mobility concerns. Visitors can explore independently, allowing flexibility to linger at sites like St. Michael's Cave and the Great Siege Tunnels, or opt for a guided tour which often includes transportation and historical commentary, typically lasting 2-3 hours and covering major highlights. The reserve is open year-round, though spring and autumn offer the most pleasant weather, avoiding the summer heat and potential winter winds that can affect cable car operation. Entry costs range from approximately £15-£20 (or € equivalent) for the Nature Reserve (including key attractions), with additional costs for the cable car (around £18-£25 return) or full mini-bus tours (approximately £35-£45). A typical visit lasts 3-5 hours to properly experience the main sites. Other insights include being cautious around the resident Barbary Macaques (do not feed them), wearing comfortable walking shoes, and bringing water and sun protection.