Answer:
Hawk Hill should remain open because it is the only park we have with a lake where people can swim and fish.
Explanation:
Based on the reason the student gave for why he wants to save a city park which was that the Hawk Hill was his favorite park and was free to visit, the best detail to add to support to saving the park would be to argue that it should remain open because it is the only park that has a lake where the people can swim and fish.
