Les 3 Vallées, located in Val Thorens, France, is the largest ski area in the world, offering over 600 km of interconnected slopes. Best visited during the winter season (December to April) for optimal snow conditions, it's accessible by car, shuttle, or train from major cities like Geneva and Lyon. Both solo travelers and guided tours work well here, depending on your skiing experience. Expect lift passes to cost around €60-70 per day, with various pass options available for multi-day stays, and ski rentals costing an additional €30-50 per day. Plan to spend at least 3-4 days to fully enjoy the area. Accommodation varies widely, from budget-friendly hostels to luxury resorts. Pre-booking is strongly recommended, especially for peak season to secure lodging and ski passes.