Croatia for the nature or the history - which way should a first trip lean?

We keep going back and forth: part of us wants the national parks, waterfalls and island-dotted coast, the other part wants the walled cities, Diocletian’s Palace and all that layered history. Tours tend to tilt one way or the other, and we’d rather not pick the wrong emphasis for our first visit. Which side left the deeper impression on you?

Easy. Do what interests you most.