The Sabine Island is not really an island at all, rather it is a mass of cypress formed by a fork in the Sabine River, straddling the Louisiana-Texas border. The easiest point of access is the Niblett Bluff campground, a nice facility with all necessities and a nice bit of civil war history as well.
From the boat launch at Niblett Bluff you can paddle south for about a mile and you are out of sight of any civilization whatsoever. From here take any channel west and you will enter the Cypress maze and some of the thickest swampland left in the south.
Alligators are in abundance here, as are slider turtles, and very interesting birds like Anhingas, woodpeckers, and Kingfishers. I've seen a Bald Eagle here on one occasion, and this is not a surprise because the waters here are teaming with big fish, especially large bass, catfish, and alligator gar. In the summer the area abounds in flowers and foliage.
All in all the area is about six miles from north to south, and about four miles in depth from the Louisiana side to the Texas side. If you want to experience some true Louisiana paddling, then the Sabine Island Wildlife Management Area is definitely one of the best choices.
Can't stress enough, once you enter the cypress swamp this place is a maze, would recommend GPS with extra batteries as well as the old standby compass and google earth map. There is no cell phone signal here.