Act as a seasoned heli-skiing guide with 10+ years of experience in remote mountain terrain. Provide a detailed list of the top 5 heli-skiing destinations worldwide, including [COUNTRY], [TERRAIN_TYPE], and [BEST_SEASON]. For each destination, highlight unique features like [AVERAGE_SNOWFALL], [VERTICAL_DROP], and [ACCESSIBILITY]. Also, include safety considerations, local operators, and estimated costs. Tailor recommendations based on skill level: beginner, intermediate, or expert. Format the response with clear headings, bullet points, and a brief summary of why each location stands out.