Last week is over. Put it behind you. You can't undo any choices you made, but you CAN make different choices TODAY.
If you figure you went way overboard and possibly gained weight during vacation - don't weigh yourself just yet... seeing a gain is only going to be discouraging. Give it a week at least before you step on the scale, to give yourself time to shed any water you may be retaining (happens due to excessive sodium and/or alcohol consumption, which is pretty likely to happen on a "vacation diet") and get your eating habits back on track.
Don't bring your "vacation eating habits" home with you - that's NOT the kind of souvenir you want!
I recently returned home from vacation myself, and the first thing I noticed that was bound to work against me was the lack of food in my house. Of course there was no fresh-anything in the fridge, I used it all up before going away.... and now there I was home, with nothing suitable to cook! My still-holidaying-instincts told me "well let's just go out for dinner" and then of course the next morning, it was "hmm well let's just go out for breakfast" - HOLD ON A MINUTE! I got a grip and made immediate-grocery-shopping my first priority. That helped a TON to put me back in my groove.
Goal 1 - break 200 (46 pounds lost)**DONE**
Goal 2 - leave obesity behind (BMI 29.9, at 185#) **DONE**
Goal 3 - BMI = Normal (154# or less)
| current weight: 172.5