If I could sneek you and your family onto the boat where I work, I'd do it for free. But I work with one other guy (I'm an inspector on cleanup work in the Cameron Parish marshes) and the gubment doesn't like for me to use their equipment for private gain.
I did work with the guy that runs this business (
http://www.mcgeeslanding.com/tour.html) for about two weeks. He leased his air boats out for our use when we were doing preliminary surveys down in the marsh. Hope it helps.