This is the 11479th most frequent German word.
stadtpark
City park.
Here, "Stadtpark" is used as the direct object indicating the location to which the action of going is directed.
Ich gehe jeden Sonntagmorgen in den Stadtpark, um etwas Bewegung zu haben.
I go to the city park every Sunday morning to get some exercise.
Here, "Stadtpark" is part of a prepositional phrase indicating the place where the meeting occurred.
Wir haben uns im Stadtpark getroffen, weil das Wetter so schön war.
We met in the city park because the weather was so nice.
In this sentence, "Stadtpark" serves as the subject of the sentence, being described for its characteristics.