In the Swedish version of the board game Monopoly, Norrmalmstorg is the most expensive street to have. (Boardwalk I think they call it in the US version)
When I was a teen we used to go here in the summers when they had festivals in this park. We then baked and sold polkagrisar (peppermint rock)
Sightseeing the Stockholm archipelago in a viking ship.
Feeding the birds on Fjäderholmarna near stockholm city.