Very worth going. Take a boat to the opposite island from the pier opposite the city hall for 10 minutes. The island is green and the relics of the ancient monastery are silent and solemn. There are also old sea defense relics, artillery, etc. across the bank, you can see Oslo, the city hall, the castle, overlooking the blue sea and blue sky, and the sails are like weaving. The beach is very quiet, with chairs in the viewing area, a great place to sit and watch the sea. There are countless green mouths on the edge of the beach, and I picked up a bag on a whim. It was very sweet to go back and clean the water.