for you for your success so far, and for planning ahead.
Personally, in your situation, I would get one of the ultra-light beers (they taste pretty much like water but when ice-cold are pretty refreshing), make sure one gets into the daily cooler and nurse that as long as possible. Supposedly light beer is allowed ON OCCASION on Phase 2 - it's just that all your occasions are happening in the course of a week
Make sure to have other stuff in the cooler for you - sparkling water, diet soda, whatever you like to drink, so you are not as inclined to keep reaching for beer after beer.
AND I would also try not to drink on an empty stomach, as that always leads to me making bad food choices. Bring cut up cheese and whole wheat crackers (yay, you are on Phase 2 now) or cut up veggies with some kind of lowfat dip or hummus.
Other alternatives include bringing a mixed drink (maybe mix it before you leave the house and bring it in a bottle) such as vodka/soda or rum/diet coke. Or of course not drinking at all! But that will be a hard choice to make with all of your friends around...
Only you can decide if you have to go back to Phase 1 when you return. You might want to anyway for a few days to get back in the swing of things. But I'd say cutting loose with tons of beer on vacation with the idea of making it all up when you return would undermine all the hard work you have already invested. Plus it would somewhat negate all the good food choices you are planning.
Oh, and just say
to the evil donuts! No good can come from that. I speak from vast experience on that topic...
Good luck to you! And have fun - run around on the beach, etc. It sounds like a lovely trip