In Sauherad kommune, Telemark, outside the town of Gvarv is a special place called Lerkekåsa (lerkekasa.no) that makes wine and claims to have the northernmost vineyard in the world. Here you can learn about the winemaking process. And you can even rent the "bed in a barrel" for the night (see bottom picture) or use more traditional accomodation. There is also an art gallery here.
The cache is just off the gravel road on the edge of the vineyard and is placed with the consent of the owner.