Josh W (.
Google
Tanto is a very beautiful and sizeable park in the heart of Stockholm. There's a lot to see and do in just the park grounds alone, nevermind the rest of Södermalm.
You have your pick of exploring it's beautiful gardens, playing beach volleyball / minigolf / football, diving off the docks to go for a quick swim, and of course, bringing a picnic basket so you can waste the day away with good company. That's barely scratching the surface, though, and it's no wonder the park is a local hotspot during the summer.