I'm on a budget wedding & time is running out with lots of my preferred venues are already booked.

I am looking for an outdoors-y, waterfront venue.. my date is June 9, 2012 so I want a place where everyone can go inside if its too hot (like maybe for the reception?) I am so lost.. I need help. I've looked everywhere and the venues are like $5000... I'd rather spend my money on the honeymoon. ANY help is appreciated.. thanks yall!
PS - If anyone knows of any barns I could rent that would be INCREDIBLE! I already know of Pratt Place but thats too far away (im from Louisiana)