No, the "hike" at Devil's Den (specifically the famous prehistoric spring in Williston, Florida) is not a hike at all, but rather a descent down a steep staircase. The site is a subterranean spring inside a dry cave; to access the water for snorkeling or scuba diving, you must climb down a narrow, wooden staircase into the cavern. While it requires some physical effort—especially if you are carrying heavy scuba gear—it is a very short distance. If you are referring to Devil’s Den State Park in Arkansas, the namesake "Devil’s Den Trail" is a 1.5-mile loop rated as moderate. It features some rocky terrain, crevices, and minor elevation changes, but most people with basic fitness can complete it in under an hour. It is more of a technical walk than a grueling mountain hike, though the "Yellow Rock Trail" in the same park offers more of a challenge with its steeper climbs to the overlook.