Sandy Hook Trail is a standout hiking destination in Highlands, New Jersey, covering 3.5 miles with 40ft of elevation change. Stats: 3.5 miles, 40ft gain, Easy. Type: Loop. Surface: Sand/Paved. Time: 1-2 hours. Fee: $20 NPS fee. Dogs: Yes. Permit: No. Wildlife: ospreys, harbor seals, shorebirds, red foxes. Best seasons: Gateway National Recreation Area trail with NYC skyline views. Pack water, layers, and appropriate footwear. Conditions vary across New Jersey. Leave No Trace: stay on trail, pack out all waste, respect wildlife.