Vivaldi sits in Hongcheon, Gangwon, just 90 minutes from Seoul by car or shuttle. The mountain is small by alpine standards: a base at 350 m, a summit at 638 m, 13 km of trails spread over 13 named runs, and ten lifts including a fast gondola. What makes Vivaldi Vivaldi is intensity: stadium-grade lights flood the runs from late afternoon until 3am, snowmaking is industrial, and the slopes never really empty. Beginners get gentle greens at the base, intermediates lap wide blues and reds off the gondola, and freestylers head for one of Korea's most-Instagrammed terrain parks, with kickers, rails and a small superpipe. The base is dominated by the on-mountain Sono Felice resort: a sprawling hotel and condominium complex, an indoor and outdoor water park called Ocean World, restaurants, a karaoke floor and shopping arcades. The crowd is young, urban and unapologetically up late. Best for first-timers from Asia, snowboarders, party groups and anyone who wants a fast, easy Seoul-side ski break rather than a full mountain holiday.