With a length of 1382 meters, Flåm Zipline is the longest one in Scandinavia. The speed of approximately 100 km/h combined with the view will give you an adrenaline kick like no other.
It starts at Vatnahalsen, which you can get to either by walking (2-3 hours) or taking the Flåm Railway. The zipline ends at Kårdalen, next to a mountain farm called Rallarrosa. Here you may want to taste some locally produced goat cheese before heading back home.
If you have rented bikes, you can ride the bikes from here to Flåm. Otherwise, you can catch the train or walk back down. For more information, visit this site.