Start in Pula, finish in Rovinj
This itinerary has one main move, from Pula to Rovinj on day three. If your flight leaves Pula, add the return coach and airport shuttle on departure day, or return the previous evening for an early flight. Pula to Rovinj, Pula airport shuttle.
One paid highlight can be enough
The Arena is the main paid stop in Pula. In Rovinj, the bell tower is optional; the church area, old-town lanes and coast do not require you to buy a series of attractions. Choose a bicycle or boat outing only if it adds something you want.
Keep the bags out of the old-town walk
Ask about luggage storage when moving between rooms. Rovinj's cobbles and steps are easier without a case, especially before check-in. Use the transfer morning for travel and lunch, then take the hill at your own pace.
Leave the last day flexible
The coast towards Zlatni rt suits a longer walk or an easy picnic. If the weather changes, shorten the outdoor time and enjoy the town. A fixed departure is the one thing the final day's plan needs to work around.