Seven Hollows Trail, AR
More Southwest than South, this 4.5-mile loop in Petit Jean State Park features sandstone arches.
Turkey Creek Trail, TX
Big Thicket National Preserve has been called "America’s Ark" for the biodiversity of its swamp/forest/plains melange. This 15-mile hike samples it all (start near Warren on FM 1943, head south). Info nps.gov/bith