Snake Den State Park Trail is a standout hiking destination in Johnston, Rhode Island, covering 4.5 miles with 200ft of elevation change. Stats: 4.5 miles, 200ft gain, Moderate. Type: Loop. Surface: Dirt. Time: 2 hours. Fee: Free. Dogs: Yes. Permit: No. Wildlife: deer, foxes, painted turtles, great horned owls. Best seasons: Historic farm and forest trail north of Providence. Pack water, layers, and appropriate footwear. Conditions vary across Rhode Island. Leave No Trace: stay on trail, pack out all waste, respect wildlife.