Poche's is about 3/5 the way. Stayed there last year. Interesting little place.
We also stayed at Bucaneer SP in Waveland. It's not that far off I-10. Take Exit 2 US90. Make sure you take Lakeshore Rd to get to the campground (follow signs to the casino). There are several grade crossing that will bottom out most trailers. In fact, a TT got stuck on the tracks and was hit by a train a couple of years ago. Trouble was they were following the state's recommended route. Lakeshore has an absolutely level crossing.