In summer consider renting a public bicycle. The cost of three days is 125 kr (or 250 kr for the whole season). You can get the card to use the bikes at any SL centre. You can use a Bicycle for three hours, then place it back in one of the 70 stations in Stockholm, and you can grab another one.
It's available from 6am to 6pm every day.

SL centre

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On a sunny day, rent a bike (or inline skates) from the waterside hire shop by the bridge to the island of Djurgarden. Traffic is banned from the island at weekends, and you can ride through beautiful green spaces, just a stone's throw from the city centre.

By the bridge to Djurgarden.

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This swanky area on the north island is really nice to walk around. From the bridge to Djursgaten island, walk or cycle north along Narvavagen. When you get to the roundabout turn left onto Karlavagen. The side streets along this route between Karlavagen and Narvavagen are beautiful, with several
boutiques and lovely cafes.

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