Answers from Our Experts (1)
Hagaparken really has it all: the crown princess castle, a long running or walking trail through nature that goes around Brunnsviken, and Bergianska trädgården (a beautiful garden with a charming café). And it's pretty central, and easy to get to.
Lill-Jansskogen on Östermalm is also a good alternative. Tantolunden on Södermalm is a nice walk between Hornstull and Skanstull.
Nytorgsparken on Södermalm is not actually much of a park, but extremely popular during hot summer days. It seems that half the city population is relaxing and eating Ice cream on it's lawn.