Blue Mountains National Park, a UNESCO World Heritage site, is highly accessible via train from Sydney to towns like Katoomba, with local buses and scenic drives navigating popular lookouts and trails. Both solo exploration and guided tours are feasible; solo travelers can enjoy well-marked paths, while guided options offer insights and access to adventure activities like abseiling. The park is open year-round, though summer can bring bushfire risks (check alerts) and winter may see snow, potentially affecting some access; spring and autumn offer pleasant weather. Entry to the park is free, but costs arise from transport (e.g., train ~AUD 10-15 one-way), parking, and attractions like Scenic World (approx. AUD 50-70). A typical visit can range from a full day trip for highlights to 2-3 days for more extensive hiking and exploring charming towns. Remember to wear suitable walking shoes, carry water, and be prepared for changeable mountain weather.