Kathryn Abbey Hanna Park features 10 miles of hiking trails near Jacksonville, FL.
"Get off on the I-95 exit to Jacksonville Beaches. Get on to Atlantic Blvd. Go down Atlantic until you reach Mayport Rd. (about 20-30 minutes) take a left onto Mayport Rd (Mayport Naval Station). Go about 5 miles down Mayport Rd and you will see signs for the park. Admission is 50 cents per person.
http://www.tripleblaze.com/trail.php?c=3&i=254