help me, I need a swamp tour

You don't need a fancy air boat tour, unless that's what you really want which will cost you and you'll need reservations.

You can have perfectly good time at minimal cost or for free at Lake Martin just outside of Lafayette (free, driving around a little wildlife sanctuary, sort of, gators included and lots of water fowl, very scenic). There is a guy that gives little boat rides there, I bought my Catahoula hound from him, kinda strange but harmless.

Or if you want you could try going to Avery Island (more touristy) where the Tabasco Plant is, cost is a couple of bucks for entry donation, and there's lots of wildlife, another driving tour.

Vermillionville in Lafayette is also an authentic cajun settlement preserved in it's entirety that's got a lot of history from the area and is very nice.

Those are the cheap ones that would get you started.