To correct the faulty parallelism in the sentence, we must change it into "On our vacation we went swimming and hiking, but we didn't go to the amusement park."
Parallelism, also called parallel structures, refers to the repetition of grammatical structures in a sentence with the purpose of improving the flow and understanding of that sentence.
For example, if you mention three activities after the main verb of a sentence, and the first two activities use -ing, the last one should also use -ing for the sentence to have parallelism.
That is the problem with the sentence we are to correct here. Two activities have -ing, "swimming" and "hiking." But, "the amusement park" is not a verb and does not use -ing. Therefore, it should not be a part of the parallel structure.
To correct the sentence, we must create another clause to eliminate the attempt to make "amusement park" a parallel structure. Therefore, the correct answer would be: "On our vacation we went swimming and hiking, but we didn't go to the amusement park."
Learn more about parallelism here:
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