A near perfect 100 kilometer loop along an Everglades boundary levee in South Florida. Beginning and finishing at Arthur R. Marshall Loxahatchee National Wildlife Refuge just west of Boca Raton. Big challenges due to heat, humidity, sun exposure and effectively no access to drinkable water. Gator sightings are near guaranteed. Lots of other swamp wildlife will be ever present, including snakes. Flat, crushed gravel. In the middle of the swamp, yet just on the edge of the mass of humanity.
Important note: sections of the loop are regularly closed or rerouted due to water management projections. It is advisable to spend some time determining any closures and alternate open trails before heading out for the full loop. This seems particularly true on the along the north section of the loop.