Fjärdlång is one of Haninge's twenty nature reserves. Here you can experience the pristine archipelago's diverse scenery and rich, interesting wildlife. Don't be surprised if you get to see elks, fox, owls and eagles. Follow one of the island's many hiking trails, which are of varying length and difficulty. Take the one that leads up to the lookout point Tysta Klint, 36 metres above the sea, and you'll see far over the ocean and bay. Fjärdlång is a great destination for the whole family. Aside from the many hiking trails, there are large grassy areas suitable for different ball games and activities. Swim from the rocks or the small sandy beach by the harbour. Rent a kayak or row boat and explore the waters around the island. In late summer and fall, Fjärdlång's berry and mushroom picking might be more appealing than swimming. Fishing, of course, can be done year round. If you want to stay in Fjärdlång for more than a day, there is year round rental accommodation as well as nice camping grounds. In fall and winter, however, there is no regular boat traffic to the island. But you can book a water taxi as long as there is no ice. Bring along your own food since the restaurants are open only in summer.
Take Route 73 south from Stockholm toward Nynäshamn. Take road 227 towards Dalarö and follow it until it ends at Dalarö hotellbrygga (hotel jetty).
Between Easter and mid-December, you can take the Waxholm boat from Dalarö to Fjärdlång. In winter, there is no regular boat traffic to Fjärdlång. But you can book a private water taxi from Dalarö.