All kinds of swing dances have become trendy and popular in Sweden lately. Chicago is one of the two biggest and best places in town. You can come for dancing several days a week, but also have a home-made cake or soda while watching the proffessionals dancing dressed up like in the 50's.
This museum tells the story of the Vasa warship, that sank in less than a nautic mille into her maiden voyage on 10 August 1628. In 1961 the ship was salvaged in very good conditions and now is one of Sweden's most popular tourist attractions.
Small island, with museum, hotel (previous a prison island) cafes, boats, walking paths, tiniest sand beach in city center.
If you have any interest in dance then The Dance Museum is a must in Stockholm! It's a quite small museum, but the atmosphere is magic. The collection are very beautiful illustrating dance, drama, art and music of different continents and civilisations, and there are also often a temporary exhibition. Even if you don't want to visit the exhibition part the café is in itself worth a visit. It's cosy and you have a gorgeous view over the royal castle and Old town (Gamla stan).
The public library is one of the most amazing buildings in Stockholm, designed by Erik Gunnar Asplund. You can go inside the round room, where you'll find more than 2 million volumes and tapes in 100 languages.