Even if you only spend a few days in the "Venice of the North", I would still advise you to get on a boat and go out to the beautiful archipelago surrounding Stockholm.
The closer islands in the archipelago, such as Waxholm, Finnhamn and Fjäderholmarna, are only an hour or two away and are nice places to wander around for a couple of hours.
It's a lovely way to spend a nice day or half-day out, and if you go during summer, the archipelago is a great place for a summer picnic and swimming - that's what the locals do.
You can catch boats from the ferry terminals at Slussen and Strömkajen, below the Grand Hotell. www.stockholmtown.com/templates/substartpage____2409.aspx?epslanguage=EN; www.waxholmsbolaget.se/
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