Liz,

I don't think everyone gains that much weight - especially if you are making an effort not to. I'm sure Marcie & Tom haven't gained 5 lbs per week. Looking at their pictures, they look just as fit as ever. So don't panic!!! My guess is that on a longer cruise you kind of settle into a routine and the newness of all that food wears off a little. You've been so good for so long and have gained a lot of skills in your weight watching. You'll do fine!!! If you do gain a FEW lbs, we'll all help you get right back on track. As you know, that is the secret. Get right back on track. That is what I DIDN'T do after my cruise and that is why I got in trouble.
Don't change your cruise plans!!!!!!! You'll do fine! :)