I am planning a trip to Croatia for late April.

We are flying into Rome and were going to take the Ferry from Pescara to Dubrovnik. Does anyone have suggestions? A few things we wanted to hit:

Stay in Dubrovik and possibly take a boat ride around some of the Dalmatian islands.
Possibly take a bus to check out Sarajevo or Mostar?
Is Montenegro worth visiting? Or Albania?

We were thinking 4-5 days. Any suggestions?