Final answer:
The most important detail for the student to include in his introduction is the setting of his first trip to the ocean.
Step-by-step explanation:
The most important detail for the student to include in his introduction would be the setting of his first trip to the ocean. The setting provides the context for the personal narrative and helps the reader visualize the experience. Describing details such as the place, time, weather, and overall atmosphere will make the introduction engaging and immersive.
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