Final answer:
The sentence 'Spielst du gern im Vergnügungspark?' is grammatically correct in German.
Step-by-step explanation:
The sentence Spielst du gern im Vergnügungspark? is grammatically correct in German. The subject of the sentence is you (du). The verb Spielst (play) is conjugated to agree with the subject, and the phrase gern im Vergnügungspark (like in the amusement park) functions as an adverbial phrase to indicate where the action takes place.
Learn more about German sentence structure