You'll do fine. We all go overboard a bit on vacation, but if you're going to Destin, I'll bet there are many healthy - and tasty options available!
Seafood! Just get it marinaded, blacked, grilled, seasoned, but not fried. And if you get breakfast at McDonald's again, an egg mcmuffin or sausage mcmuffin has fewer calories, and they're delish too.
And when it comes to pizza, veggies and thin crust might be a good request... if you can request...
But seriously, have fun, and if you go off your diet a little bit, no worries! Don't stress the small stuff.
And walking the beach might be good exercise, and shopping around too!
Have fun, and you'll be FINE!