Boy Scout Tree Trail (U.S. National Park Service) NPS Photo /  Melissa Hartwood. This rewarding hike though old-growth redwoods is popular for those in the north wanting a bit of a challenge - both physically and logistically. Located in Jedediah Smith Redwoods State Park, visitors should consider this as a half-day experience to access and then walk this 5.5 mile round trip trail. During this walk, you will follow riperean areas, see 'Fern Falls' and lots of big trees.