Lehen works best when you read the district as a simple route: Stadt:Bibliothek Salzburg, makerspace (an open room with tools and technology) @ Stadt:Bibliothek and the Lehener Park / Glanspitz sit close enough together to create a real quiet afternoon.
Three building blocks that hold together
The Stadt:Bibliothek Salzburg at Schumacherstraße 14 is open through the Open Library every day from 6:30 to 22:00. For young people, that is strong because you can read, study or simply sit there without buying anything.
The Makerspace @ Stadt:Bibliothek adds a second clear anchor. The MINT (maths, computer science, natural sciences, and technology) page lists free sessions for 11- to 18-year-olds, and one concrete slot is shown for April 9, 2026 from 15:00 to 18:00. That is exactly the kind of fact that turns a maybe-plan into a real one.
The Lehener Park and the Glanspitz add the third layer: go outside, walk a little and do it without immediately having to consume something. The city describes both as large open space, with movement and lounging areas at the Glanspitz.
When Lehen does not fit
If you want shopping, a party or a loud late-night program, Lehen is too calm. In that case another district is the more honest choice.
Next step without a car
Start in the library, only go to the Makerspace if the time slot really fits, and end with a walk along the Glan. That keeps the plan short and repeatable.