Stadshuset is one of Swedens most famous buildings, designed in 1907 by architect Ragnar Östberg, who was very inspired by italian renaissance architecture at the time. Next to it is the newly finished Stockholm Water Front building.
During the summer Trädgården is the place to be if your out clubbing. It has a great festival atmosphere. The chance of you getting seperated from your friends is immidiate but you will meet new ones. I have a love-hate relationship with this place, watch out for the massive que and the ill willing pointers.
This is a great spot for lunch or coffee! In the summer you can sit outside. They have a beautiful botanical garden and is located next to Brunnsviken (lake). The also have a huge greenhouse with plants from allover the world.