I second what everyone's said about not restricting or doing a starve day before, and especially about figuring out what causes binges for you.
It might also help to remember the math of fat: 1 lb = 3500 calories, so 8 lbs = 28000. In order to gain back, in four days of vacation, the 8 lbs you lost, you'd have to eat 7000 calories a day. And that's not accounting for any sort of activity, so really you'd have to have a
surplus of 7000 calories a day. I think that's highly unlikely. Just remember that any
scale weight you gain while on vacation is like extra weight from the food itself and the water it holds.
Do try to relax and enjoy yourself. That's what a vacation is for.
