Indoor mini golfing at black light.
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The building is an architectural marvel in itself, inside and out, but the highlights are obviously the exhibited examples of historic Porsche cars (and cars that Porsche designed for other companies, like the legendary Volkswagen "Beetle"), taken from Porsche's impressive collection of more than 500 historic and significant automobiles. A visit may be combined with a factory tour (you have to contact the museum to arrange for that).
Go watch a baseball (or softball) match. The Stuttgart Reds play in Germany's first division. Season from spring to early summer.
Observation tower (27 m). Accessible in summer on the weekends. View of Bad Cannstatt and the Neckar Valley. Admission free.
Killesberg Tower
A tower in the "Killesberg Park" (see also "green U" under Parks & Gardens), north of the city centre.
Höhenpark Killesberg