Thanks, I'm in Lousyana, too.
I know about the state parks. On Thursday, I'm taking my class on a picnic. We reserved a shelter and all that.
Whenever there is a school related functions, you can get the cabins/shelters for $0.

Those cabins are nice...
This isn't an option, the principal needs a "conference" area as well as a place to sleep. I think the Mississippi Gulf Coast may be an option. I think there is a place in Alabama, too.
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