Not necessary. Some parts you may want it but you can tell before you get too deep in that part of the trail. The majority of the park is easy enough in shorts
If you travel back to the farthest north trail it's not mowed and is only a narrow foot path. So then I would suggest long pants.
Totally up to the person. There is no need. The paths are clean trimmed.
It's pretty buggy, but also humid, so it depends on how reliable the bug spray you're using is.
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