Do you like Opera? In august they have a great outdoor performance. This year it`s Rigoletto. You go by the boat for 1 . 45 hour and have a great experience and a lovely sailing in the Oslofjord.
Unique things to do nearby
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Kayak on Lake - Lunch - Wilderness
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Hiking tour and picnic in National park Østmarka
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Oslo - Scenic Hike & Norwegian Waffles with Local & Dog