I know Mr. Jimmy Guidry (owner of Hub City Diner) is a pretty accommodating guy… I obviously can't answer for him and say they will allow you to shoot there, but I'd be surprised if you couldn't work something out… I also 2nd the notion of Palace Cafe in Opelousas. I worked for a short time at the courthouse across the street and stopped there a couple times for lunch and the place kinda creeped me out. Definitely has an old time feel there...