Today I was at a wonderful viewpoint in one of the many recreational areas around Stockholm, it is called Paradiset (Paradise!) in southern Stockholm (near Ådran) more about all the naturreserves and recreational areas here (use Google translate)
There is many wonderful trails in the same area (picture above) as the viewpoint. Great for trail running or just to stroll.
There are other very nice areas around central Stockholm, the most famous is kaknästornet
Fjällgatan and Monteliusvägen (both at södermalm, the southern island) are not to be missed
And Globen sky view has an outside elevator here
Take a viewpoint day in Stockholm and you will increase your research energy.
If you are VERY new to Stockholm, why not take a bike sightseeing trip here
Enjoy beautiful Stockholm that is second on the list of the most beautiful cities in the world.