I spend 2-3 weeks each year in South Padre Island, TX (which is right across the bridge from Port Isabel, TX) I can honestly say that it seems none of the cooks in that area know ANYTHING about gluten free. And the people at McD's would be the people who couldn't get a job at one of the nicer establishments. OOOPS Sorry, I shouldn't diss someone for working at McD's. I hope you found some nice places to eat. I have had good luck at the Shrimp Haus, Louie's, Palmettos, and a few others. I was very thankful to have my Triumph Dining card at some of the other places.
I am glad you had a good experience at Marcello's. I love their shrimp there. I enjoyed reading your blog and hope you made it to a few other island restaurants!
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