Limestone. The area is mostly made up of exposed limestone bedrocks which can be quite sharp, and generally, it's a good idea to wear shoes on any trail to prevent falls.
Its limestone which can be slippery and cut your feet
Sharp limestone
Sharp rocks and water. Some of the trail can be slippery if wet
Safety issues, its just better to be not barefoot. Stability as well.
Safety issue. In addition the stairs could be slippery walking through wet areas
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