I went with my uncle a couple of times, over thirty years ago. We went around the Port Hudson area and found a few things. The coolest was a civil war sword. Have any of you been?....found anything cool?
Baton Rouge is a great place for electronic archeology. There is a lot of history downtown and there is a very active metal detecting crowd in BR. If you drive around downtown on a weekend morning, you'll probably see guys with their sticks playing cat and mouse with the police.
If you want to get into treasure hunting, go to a local dealer and buy a used detector from one of the better companies like White's or Fisher. Don't buy from Kellyco. Go visit the online forums and join a club and learn from the veterans.