Gambusia Nature Trail is a 0.9 mile lightly trafficked loop trail located near Port Arthur, TX that offers the chance to see wildlife. The trail is good for all skill levels offers a number of activity options.
Sea Rim State Park Trail is a 6-mile trail located near Sabine Pass, Texas that offers the chance to see wildlife. The trail is rated as moderate and is primarily used for hiking and mountain biking.
This trail is located in Sea Rim State Park. It was more of a walk than a hike though. It was a quick 3/4 mile loop all on a a board walk over a marsh. There were plenty of birds for those who are into those things - egrets, ducks, etc. I was told there may be alligators so you should be careful around the sections that were overgrown with swamp grass. I didn't see any, but perhaps I should have gone around dusk or dawn when they would be out for food.