Go watch a baseball (or softball) match. The Stuttgart Reds play in Germany's first division. Season from spring to early summer.
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Observation tower (27 m). Accessible in summer on the weekends. View of Bad Cannstatt and the Neckar Valley. Admission free.
Small lake next to the Neckar river. Popular for jogging, sailing, fishing and BBQs at the weekend. Also small boats can be rent. Swimming is not permitted.
Feuerwehrmuseum
Museum about the history of firefighters including some old fire trucks.
Natural History Museum
Two exhibitions: one features biology and evolution and the other features paleontology and archeology in two separate buildings (Schloss Rosenstein and Museum am Löwentor / about a 10-15min walk apart).
Ruin of castle Hofen
Remains of a castle from the 13th century.