Old monastery, Second World War air defense place, old castle area. Nice little island for a picnic in sea scenery. I took a sightseeing tour from the docks with 200kr which ended up to the island. It was windy and rainy day so 15minutes around island was enough. Return with route boat is included so you can stay as long as you will. Boats back to the island go every hour until 18 o'clock in high season. On a sunny day would definitely been longer there.