Croatia can be crossed from Zagreb to Dubrovnik without renting a car, but the useful route is not a driving itinerary with the steering wheel deleted. It must follow the transport network. This plan gives Zagreb two nights, inserts one deliberate sleep beside Plitvice Lakes, then moves through Split and Hvar Town to Dubrovnik. Each base has a direct operational job: Zagreb connects the airport to the first coach; Plitvice turns an overpacked transit day into a full park visit; Split changes the mode from road to sea; Hvar supplies a genuine island evening; Dubrovnik closes beside a practical departure airport.
Plitvice is the critical inland decision. Arriva currently lists early Zagreb departures of roughly two to two and a half hours, and the national park confirms bus stops near both entrances. The entrances are around three kilometres apart, however, and southbound service toward Split is not a turn-up-and-go guarantee. Book the onward coach before the room, then choose accommodation whose transfer to that exact stop is documented. On arrival, use the park’s free luggage storage and complete one signed programme. Sleeping locally means you do not have to sprint from a timed boardwalk circuit to an uncertain evening bus.
At Split the logic changes. Stay close enough to move a case to the passenger port, spend a full day inside and around Diocletian’s Palace, then board for Hvar Town. Do not confuse that harbour with Stari Grad. The Hvar stay is intentionally narrow: the town, Fortica when conditions suit, and either a Pakleni outing or Stari Grad on the full day. Travellers without a vehicle gain freedom from parking and car-ferry costs, while giving up spontaneous coves and an island-wide circuit.
The direct Hvar-Dubrovnik boat makes the final leg elegant only in season. TP Line’s published 2026 line 654 runs from 8 May to 18 October; it lists 10:40 from Hvar, 14:15 in Dubrovnik and a EUR 50 adult fare. If the exact-date service is absent, the honest solution is to remove Hvar or return through Split, not to keep non-refundable rooms and hope. Pack light, keep transfer mornings uncluttered, and use live accommodation prices inside the districts that reduce walking, steps and missed departures.