Sorry.... I HAD to laugh, Izzy. You really knew the points to a Lindt Chocolate Truffle??!! That's sooooo good.
Addressing your question, Flagal, I'm in the same situation you are, hoping not to gain too much while on vacation. (Especially since we are going just prior to the holidays and I'm hoping to keep my weight in check.) I've found that if I stray from counting points, even for just a week or 10 days, I gain 6-8 pounds -- which then takes me almost a MONTH to lose!
I think that if you plan on eating a low-cal, high fiber breakfast to start, (maybe cereal and fruit, or a bagel, for example) it will give you some energy for the parks and you won't be tempted to snack in the late morning. If you DO need to snack, pick up an apple or fruit cup from one of the fruit stands.
At the buffets, don't be tempted! You KNOW what's good and what's bad!!
Try to stick with what's been working for you so far -- do you eat a high fiber cereal in the morning, or fruit? Maybe a turkey sandwich or salad for lunch? I think if you keep as close to your current daily menu, it will be easier for you to calculate your points. You know all of the things that work -- keep an eye on portion sizes, drink lots and lots of water.
Also, don't forget all of the WALKING you will be doing during the day!! Those bonus points will add up quickly. If you stick to the low fat/low cal/high fiber options during the day (with minimal snacking), you should be GOLDEN for dinner. Think of all of those points you'll have for a nice dinner! (Just nix the bread, butter and sauces.)
Of course there will be those people who say, "Hey you're on vacation. Live it up!". You can do that too. However, I've fallen off the points wagon a few times, enough to know that it's not worth it. When you have a goal in mind, and you take a week off from the program, it sets you back a month. That is so demoralizing. It will be much more rewarding to go back to your WW meeting having maintained (or gained only a few pounds) during your Disney vacation. You will feel really good about yourself.
HEY, you might even LOSE weight. All of that walking works to your advantage!!
Good luck!!