to odemnie:

Rumunia : Forteca Poenari nad rzeką Arges   <- ruiny zamku Draculi

Drodzy Zukowicze:

Prodsze uwzglednijcie w planie podrozy !

List od Serba z serbii :

Piotr,

places to visit: 

Serbia:

http://uk.reuters.com/article/idUKTRE5AC0NE20091113

+ Novi Sad, which is further to the north looking from Belgrade, a bit more quiet thou. Subotica is also near by, small town, but beautiful nature. But at this time of a year could be a bit cold and deserted. Only from April onward i would suggest it.

Croatia:

Coast + Islands. Dubrovnik is very attractive. But pretty much everywhere is nice. Islands especcialy.

Montenegro:

Coast again, Kotor is in a bay, nice historical town, short drive from Dubrovnik. Budva is the largest town on the cost, it has very special old part of the town. Cetinje is cultural center of the country, and Podgorica, capital city, is very industial.

Place to avoid in a big circle is Kosovo, it is a cancer of Balkan. Bosnia again, you can drive through, but apart from few monuments, a bit miserable.

This is a mainstream guide, if your friends are adventurists, they might want to explore deeper inside, but again i would be very careful in Bosnia and Kosovo. Dagmar for instance, went to Kosovo, and has a possitive experience. But don't forget that for an archictects rust has beautiful properties!

If they have any questions, i would be very happy to help.