My feeling is that you can't go the rest of your life counting every calorie so you NEED to figure out how to live in the "real world". IMO, people who learn how to function at restaurants and without their scales and books are the ones who keep the weight off long term.
That said, as my former WW leader used to say, it's not about willpower, it's about SKILLpower. Here are a few tips:
1) drink lots of water. Lots and lots and lots then drink some more. Thirst is pretty often disguised as hunger, plus you need to stay hydrated in the hot florida sun. When you sit down at a restaurant, don't order until you've downed at least one full glass of water.
2) start EVERY meal with a salad, dressing on the side. Drink another water with it. If you fill up your stomach with salad and water even if you order the most evil thing on the menu you won't be able to eat all that much of it because you will be more full.
3) Don't finish it because it's on your plate or because you paid for it. If you think that is an issue, order a salad and an appetizer instead of a main meal. When I am "in the mode" I can pretty easily stop when I am done and send back a half full plate. DH and I also love to share things.
4) If the "fancy food in fancy sauce" sounds way better than grilled chicken with steamed veggies, get the fancy food in sauce and get the sauce on the side. Like with dressing, dip your fork in the sauce then spear your food. Don't feel like you are denying yourself because after a day or two you will fall off the wagon and gorge on bad food.
5) Avoid buffets unless you can eat a couple of plates of salad before making your selections.
6) WDW days are long days. Eat every couple of hours, and try to have at least some protein with every snack. Nuts are a good snack for staving off the hunger. Don't "save your appetite" for a big meal, that's the road to overdoing it. Willpower is a LOT easier if you are not starving when you first sit down to eat.
7) Plan a few treats. Say "I love mickey bars, on my last day in the parks I will have a mickey bar." This way you have something to look forward to and it's a lot easier to pass up all of the treats along the way if you have something to look forward to. Yes, you're playing a mindgame with yourself but to me any feelings of deprivation soon lead to wanting to eat everything in sight.
I hope some of that helps. People ask me how I have so much willpower when I am "on" (when I am good I am very very good but when I'm bad I'm horrid). It's not willpower at all, it's just setting things up so that I don't HAVE to make tough choices... a touch choice is when my blood sugar has plummeted and I'm not, tired, cranky, maybe even shaky and I just want something bad and I don't care. A tough choice is when I deny myself to the point that I have to wonder why I'm doing this in the first place. Avoid tough choices and you don't NEED to have willpower to resist bad foods, you will just feel happy making the better choices for yourself.
If we had Disney attractions in our neighborhoods we would walk all the time 
