Vatnajökull National Park, encompassing Iceland's largest glacier, offers a diverse range of landscapes from glacial ice caves to volcanic areas and waterfalls. Accessibility varies greatly depending on the specific area; some parts are easily accessible by car, while others require guided tours due to hazardous conditions. Solo exploration is possible in designated areas, but guided glacier walks and ice cave tours are highly recommended for safety. Seasonal restrictions apply, especially for ice caves, which are typically accessible only during winter (November to March). Costs can range from free for general park access to upwards of $100-$200+ for guided tours. A typical visit can last from a few hours to several days, depending on the activities planned. Be prepared for unpredictable weather and dress in layers. Consider booking accommodations and tours well in advance, especially during peak season.