Stockholm has become my second favorite city in the whole world, after Paris. Stockholm is spread out over several islands, and this contributes to part of its beauty - think Venice. Also, Gamla Stan (Old City) is quaint and facinating. While in Stockholm, we took a ferry and spent a half day in the islands. You could spend a life time exploring them since there are over 30,000!
We completed our visit of Sweden by staying in Kalmar for a day.