Here is a list of all of Louisiana’s public recreational land. This includes State Parks, forest and wildlife management areas and refuges and also the Federally run National Forest and wildlife areas and refuges. Looking through these, I am not seeing accessibility addressed, but there is contact information for each place so you could call or write to learn more.
Category: Louisiana misc
Rails-to-Trails – Louisiana
The Rails-to-Trails Conservancy lists wheelchair accessible trails in Louisiana.