New N5 L8 Reading Discussion

This is a discussion topic for the updated N5 Lesson 8 reading passages. (May 2024)

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Hello! Can you please help me with understanding the use of a particle? Towards the end, A says “Is it okay to ride a bicycle in the park?” Why is it 公園を instead of 公園に?

Could using に still make an acceptable sentence? I’m struggling to break down the nuance here, so any help would be much appreciated. Thank you!