I am meeting family in Europe in fall. Most of the days were planned already and I have 4-5 days extra for myself. I'm thinking to fly to Croatia cuz I've seen amazing pictures of the Plitvice Lakes N.P. For 4-5 days itinerary, I also want to know if it's possible for me to go to Zadar, Split, Dubrovnik, or Zagreb on top of the Plitvice Lakes N.P.
Can I go to them all? Can anyone suggest me a reasonable route that can cover most if not all? Transportation? (by train? By plane?) Days in each city?