Mackerel Cove Trail is a standout hiking destination in Jamestown, Rhode Island, covering 2.5 miles with 80ft of elevation change. Stats: 2.5 miles, 80ft gain, Easy. Type: Loop. Surface: Dirt. Time: 1-2 hours. Fee: Free. Dogs: Yes. Permit: No. Wildlife: deer, ospreys, herons, harbor seals. Best seasons: Beach and coastal scrub trail on Jamestown. Pack water, layers, and appropriate footwear. Conditions vary across Rhode Island. Leave No Trace: stay on trail, pack out all waste, respect wildlife.