Palmetto State Park: Hiking Trail Professional Review and Guide
"Nature lovers will enjoy the trail as it passes near the San Marcos River. The area contains perfect habitat for birds, frogs, insects, and possibly a snake or two. Watch for springs in the swampy area, which many years ago contained hot springs and mud boils.
See the remnants of hot springs, which, in the 1930s, people thought cured polio. From the trailhead, pass a small clearing where a few dwarf palmettos are growing beneath taller trees. The woods continue for the balance of the hike and furnish welcome shade.
After completing a couple of turns, come to a sign on the left that indicates the presence of a mud boil. Look hard—there is no boiling mud, just a wet depression in
the ground near the sign. Prior to the 1970s, this area was wetter and had more thermal activity, including hot springs that created mud boils. This activity probably ended due to changes brought about by the widespread drilling for oil and water."