One thing that will help is the massive amount of walking you will do in Europe (site seeing, shopping etc.) much more so than in the US. That will help in burning calories. Also take advantage of the good food you will only be able to get in Europe. Enjoy the culture, and enjoy the food that goes along with it. If you are not competing, no need to worry so much. When i was living in Europe, I was able to endulge a bit more than usual because of the constant walking. And I lost bodyfat while doing so.
Also note that portions of food are a bit smaller in Europe than the US. This will also help.
On a side note, I have never found Ice cream here in the US like I did in Italy. You won't be dissapointed!!