Photo by Art BicnickLimits will be imposed on ice cave tours in Vatnajökull National Park this winter. The ice cave season begins in October. Last year, around 200,000 people took part in glacier hikes or ice cave tours in the park. “So currently, 30 companies have contracts with the park to lead glacier hikes and ice cave tours. Ice cave tours in Vatnajökull National Park alone generate significant revenue — four to five billion ISK per year.