Here is a direct link to a map for the Tammany Trace, as it follows the old RR tracks for St Tammany.
Tammany Trace Map
Also, a link to a list of the Tammany Trace Trailheads where parking, restrooms, and refreshments / water are available.
Lots of woods, peace and quiet, clean fresh air, great exercise, beautiful scenery, birds, wildlife. What more could you ask for. Awesome.