I actually hit my ww goal that week I got back!! And lost 1 pound that week on the DP...
just eat what you want and be satisfied but don't GORGE yourself...because I don't know about you but 6 pounds like some are saying, is a whole SIZE for me, I am 5'2....
remember to drink your waters to help you out with loss and feeling full so as not to stuff yourself sick. I ate what I wanted, when I wanted it, in moderation...NO NOT MEASURING but just not PIGGING out all the time. PLUS I would do laps in the pool, run the walkways at the Poly late at night, and do situps at night before bed. That was it.
If you are serious about loosing and keeping it off then I would suggest you do a low cal/high exercise week before and after the trip...this is just my advice after loosing nearly 40 pounds and going from a sz 14 to 6...and NO amnt of Dole Whip would make me happy enough to go back to that again...but having fun and enjoying your food and desserts at WDW is totally fine. Just be prepared to work it off if need be when you return
I would also say that if you ARE NOT used to walking or exercising you would probably loose a bit more that week just but giving yourself more activity from walking. If you are already a walker/runner than the park trek is probably not going to make a huge difference.
OK there I go spouting off again sorry
probably more than you wanted to know...
have fun and enjoy all the world has to offer!!