To get a good impression of Stockholm: get into a boat. At the palace at Gamla Stan you can do boat tours. One hour tours cost only 8 euros per person.
. ~ BY BOAT ~
Because it is a capital built on many Islands...the best way to see everything is traveling by boat!!
If you have spent a few hours at Gamla Stan, and want to go to Djurgården, you should take the Djurgården ferry.