Vacations are rough, especially when you don't have the language skills to know what you're getting. They're temporary, and sometimes, all you can do is your best.
I found this article, which recommends going heavy on the rye bread and cabbage and sauerkraut, for their fiber and vitamins:
http://www.ehow.com/way_5412423_heal...rman-food.html
You might try watching your portions pretty carefully, and eating the veggies on your plate first.
If you're not sure what you're ordering at all, here's a guide of regional specialties with translations...that might help you identify the things likely to be lighter:
http://www.diabetes-gate.com/nutriti...pical_food.htm
Most of all, know that this is temporary, you're doing the best you can, and that eventually you'll be back in your home and routines.
And I'm not sure if you're in an area where you can safely run, but at least try to get in lots and lots of walking...both for the exercise and to see the sights!