The 5-hectare (12-acre) island has a campground, a cafe, kiosk, pub, and soccer field, along with grasslands and sandy beaches.

It also housed a school for Germans during World War II and was the location of the Norwegian championship in boxing in 1933 and chess in 1935.

[2] During the German occupation of World War II, Granholmen Hotel was housing NS Ungdomsfylking, the youth organization of the fascist party Nasjonal Samling.

[1][3] Today, the island is used for a variety of outdoor activities, including sailing, kayaking, rowing, camping, hiking, swimming, boccia, soccer, and more.

The island was also home to a sandy beach and a jumping tower, where visitors came to swim, sunbathe and use their boats.