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Taking a ferry to Hovedøya is one of the easiest ways to experience nature and islands close to Oslo. The best part is that the ferry is part of the public transport system, so you don’t need a special ticket — it costs the same as a metro or bus ride.
The island is perfect for a relaxed hike. I walked about 5 km around it, and the route was easy, scenic, and very peaceful. You get great views back toward Oslo, plus beaches, ruins, and forest paths along the way.
I filmed the ferry ride, the hiking route, and shared practical tips in my Oslo video on mariia.with2i. It’s a great option if you want a half-day escape from the city.