It depends what you’re into. If you’re into good beaches, Albania and Greece are definitely the places to go (Greece all beaches honestly but especially islands and Albania all the beaches to the south of Vlora, don’t bother with the northern ones). Also Croatia and Montenegro do have beaches but they’re not worth it compared to the Ionian Sea ones (so southern Albania and Greece)

If you’re into cultural tourism, Albania has plenty of cities and Greece is obviously a clear choice too. I would also recommend Bucharest and Dubrovnik (Croatia). Albanian and Greek culture are very distinctive from the rest of the Balkans so they’re worth seeing and honestly Dubrovnik is a magical place, same goes for Bucharest.

Personally I haven’t enjoyed my visits to Bosnia, Kosovo, Macedonia or Bulgaria THAT much. There are some nice parts (Northern Kosovo has some lovely mountains that truly make you feel like you’re visiting the swiss alps, or Macedonia has some nice skiing locations), but I wouldn’t say they’re fully worth a visit. I’d honestly go down the coastline of Croatia (Dubrovnik is a must see), Montenegro (Budva), Albania (skip to the southern coastline, preferably Himara and Saranda and detour to some cultural cities like Berat or Gjirokastra) and Greece (northern for beaches, southern to go to Athens and maybe end the tour with a nice visit of the Acropolis)

Safety wise, it’s safe af. Everyone knows everyone, the police doesn’t have much to do so it’s very easy to find criminals. My whole life in Albania there have been maybe only 1 or 2 crimes unresolved, hit and runs are non existent, pickpocketing is honestly extremely rare (I’ve never heard of any pickpocketing case in my life here), random violent crimes are very rare. Athens might be slightly unsafe and more of a Western capital vibes wise, the rest of the Balkans are incredibly safe for tourists (your biggest threat is that you’ll get tricked into paying higher prices lol)