I am sorry when we were there stayed overnight and walked an adult trail. It was our first time. We are going back to adventure more throughout the area. Sorry I couldn't help
I do not know about the swimming, but I am pretty sure that there are not any places where swimming is allowed. However, I do know that there are some small trail loops going from certain parking lots. I don't know what you mean by short, so you may want to view an online trail map of the park.
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