Good luck

Based on my experiences there a few weeks back, staying lo-carb and eating in the parks is pretty difficult, especially eating quick service. I think it is technically possible if you are really committed to it.
I have been lo-carbing since January and I decided not to stay on my diet while @ WDW for Spring Break - I didn't go too crazy but I did eat my fair share of Dole Whips. Despite walking ~27K steps per day I managed to gain 6 lbs in 8 days, which seems physically impossible, but scales don't lie.
the good news is that adjusting back on to my diet was pretty easy, and as of yesterday morning I had lost the 6 lbs (only took about 9 days.) Based on how fast the weight went on-and-off I suspect a fair amount of it was water weight? I normally don't see a lot of rapid weight fluctuation (even when I am not dieting) but obviously that wasn't the case this time.
So unless you find re-starting your diet to be extremely difficult, you could consider just eating what you want for your vacation.