Take a ferry and go island hopping between the islands in the Oslo Fjord.
With a regular public transportation ticket or an Oslo Pass you can easily get on and off any of the ferries going between Rådhusbrygge 4 (behind City Hall), Hovedøya, Lindøya, Nakholmen, Bleikøya, Gressholmen and Langøyene.
The islands are popular places to go swimming in the summer, but each island has its unique character and history worth exploring. Bring a picnic basket and a blanket and enjoy the peace and quiet just minutes away from the city centre.
Route B2: Rådhusbrygge 4 - Hovedøya - Lindøya vest - Nakholmen (Jun-Aug)
Route B3: Rådhusbrygge 4 - Bleikøya - Gressholmen - Lindøya øst - Hovedøya (Jun-Aug)
Route B4: Rådhusbrygge 4 - Hovedøya - Gressholmen - Langøyene (Jun-Aug)
Route B9: Rådhusbrygge 3 - Bygdøy (Mar/Apr-Sep/Oct)
Rest of the year:
Route B1: Rådhusbrygge 4 - Hovedøya - Lindøya øst - Bleikøya - Gressholmen - Nakholmen - Lindøya vest - Hovedøya (Aug-Jun)
Route B9 is covered by the Oslo Pass, but not by the regular tickets.
The routes have different schedules for different times of year. Check ruter.no for updated schedules.