I sympathize with you, a week in Montenegro is very, very short, I know for myself it was a week. Such a small country, but very beautiful and interesting. Bay of Kotor, Ostrog Monastery and walks around the old town, listen to a concert sitting on the seashore, and if you walk along the sea, you can go through several towns. Dubrovnik is far away and there is little time left, Bosnia Herzegovina is very far away and not interesting. I envy you well.