Gullvåg began as a small farm owned by Esten and Dagmar Gullvåg. In the 1950s, they started welcoming travelers from the European Route 6, renting out simple wooden cabins and rooms on the second floor of the old main house.

Since the couple had no children, they bequeathed the Sandstad (Gullvåg) property to Aud and Olav Nyberg, who were running a Texaco station in Berkåk at the time. This was in the late 1960s. Aud and Olav became industrious owners and transformed the small farm into a modern campsite. The barn was demolished, and a new sanitary facility was built on the barn's foundation. They also built 22 cabins supplied by Sande Hyttefabrikk in Berkåk. The land was separated from the old farm on the other side of the E6, which belonged to Eirik Gullvåg (Gullvog).

Aud and Olav, along with their five children, ran the summer camping at Gullvåg until the summer of 1988. When Olav became ill, Aud needed help running the campsite. Their son Odd and his wife Oddfrid stepped in and took over the operation. The plan was to help out for just one summer, but they are still running the campsite to this day.