You have been posting some great threads recently! I know you have your "big" cruise vacation coming up in Nov, too, and that this vacation-eating thing has been on your mind (saw your post about cruise food over on the cruise board too!

Anyway, I think it is good you are trying to get a game plan when it comes to this vacation thing.
Having just returned recently from a week at WDW, I can tell you that I wanted to (and did!) enjoy some treats while on vacation, but I did not throw my entire healthy eating plan out the window. My goal on vacations now is to try and maintain my weight, as the last thing I want to do is have to contend with a gain on vacation and then have to work hard to lose the same weight twice!
I guess I am trying to look at this whole weight loss thing as a lifestyle. I figure I need to eat healthy for life, and it is okay to include some treats once in awhile in that plan. But for me, balance is important and is key to keeping the weight off.
While at WDW I ate a very light breakfast, consisting of fresh fruit or a protein bar. I tried the foods I wanted to try but never finished a plate of anything, always keeping in mind the importance of portion control. I got my walking in (of course...I was at WDW for cryin out loud!) and did not gain weight during the trip. I did try desserts and I did drink a few more alchoholic drinks than I had planned, but I survived without an extra pound on the hips!
I do hear of people who throw out their healthy eating plan while on vacation, but personally I would find it too difficult to get back on track when I returned from vacation if I had this approach.
Linda