If your teen can’t get enough horsepower out of their hiking boots, look for 12- to 16-day summer adventures for high schoolers that string together glacier trekking, sea kayaking, and a via ferrata ascent of Hornelen—the highest sea cliff in Europe. Expect nights in cozy mountain lodges, lunches on rock outcrops above emerald water, and a final summit of Galdhøpiggen, Norway’s tallest peak at 8,100 feet.