Gulf Islands National Seashore Trail is a standout hiking destination in Ocean Springs, Mississippi, covering 5.0 miles with 20ft of elevation change. Stats: 5.0 miles, 20ft gain, Easy. Type: Loop. Surface: Sand. Time: 2-3 hours. Fee: $20 NPS fee. Dogs: Yes. Permit: No. Wildlife: dolphins, shorebirds, brown pelicans, sea turtles. Best seasons: Barrier island trail with stunning Gulf of Mexico views. Pack water, layers, and appropriate footwear. Conditions vary across Mississippi. Leave No Trace: stay on trail, pack out all waste, respect wildlife.