Diet help plz?

iv been on a diet the past couple of weeks, i lost weight and right now im on vacation out of the country!.. i usually gain weight after vacations.. but i really really dont wanna gain back my lost weight in this one! what should i do to maintain and stable my weight. ( we walk a lot over here), in the place that im livin in right now, there is no single corner that does not have food lol. Help?